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31400253 = 323488917
BaseRepresentation
bin111011111001…
…0000100111101
32012002022001100
41313302010331
531014302003
63041003313
7530616633
oct167620475
965068040
1031400253
11167a7525
12a623539
136675441
144255353
152b53ba3
hex1df213d

31400253 has 6 divisors (see below), whose sum is σ = 45355934. Its totient is φ = 20933496.

The previous prime is 31400249. The next prime is 31400261. The reversal of 31400253 is 35200413.

It can be written as a sum of positive squares in only one way, i.e., 26656569 + 4743684 = 5163^2 + 2178^2 .

It is not a de Polignac number, because 31400253 - 22 = 31400249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1744450 + ... + 1744467.

Almost surely, 231400253 is an apocalyptic number.

It is an amenable number.

31400253 is a deficient number, since it is larger than the sum of its proper divisors (13955681).

31400253 is a wasteful number, since it uses less digits than its factorization.

31400253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488923 (or 3488920 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 31400253 is about 5603.5928652963. The cubic root of 31400253 is about 315.4842740028.

Adding to 31400253 its reverse (35200413), we get a palindrome (66600666).

The spelling of 31400253 in words is "thirty-one million, four hundred thousand, two hundred fifty-three".

Divisors: 1 3 9 3488917 10466751 31400253