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31609201 = 132579461
BaseRepresentation
bin111100010010…
…1000101110001
32012110220200011
41320211011301
531042443301
63045254521
7532450051
oct170450561
965426604
1031609201
111692a508
12a704441
136719590
1442ab561
152b95a51
hex1e25171

31609201 has 8 divisors (see below), whose sum is σ = 34176744. Its totient is φ = 29061120.

The previous prime is 31609189. The next prime is 31609213. The reversal of 31609201 is 10290613.

31609201 = 39752 + 39762.

It is an interprime number because it is at equal distance from previous prime (31609189) and next prime (31609213).

It can be written as a sum of positive squares in 4 ways, for example, as 11895601 + 19713600 = 3449^2 + 4440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31609201 - 211 = 31607153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31609231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (4272093).

Almost surely, 231609201 is an apocalyptic number.

31609201 is the 3976-th centered square number.

It is an amenable number.

31609201 is a deficient number, since it is larger than the sum of its proper divisors (2567543).

31609201 is a wasteful number, since it uses less digits than its factorization.

31609201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9731.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31609201 is about 5622.2060616808. The cubic root of 31609201 is about 316.1825075341.

Adding to 31609201 its reverse (10290613), we get a palindrome (41899814).

The spelling of 31609201 in words is "thirty-one million, six hundred nine thousand, two hundred one".

Divisors: 1 13 257 3341 9461 122993 2431477 31609201