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30581689 = 2953101197
BaseRepresentation
bin111010010101…
…0001110111001
32010112201012011
41310222032321
530312103224
63011245521
7520640305
oct164521671
963481164
1030581689
1116298526
12a2a98a1
136449998
1440c0d05
152a41394
hex1d2a3b9

30581689 has 16 divisors (see below), whose sum is σ = 32717520. Its totient is φ = 28537600.

The previous prime is 30581669. The next prime is 30581699. The reversal of 30581689 is 98618503.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 13935289 + 16646400 = 3733^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 30581689 - 27 = 30581561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30581669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155139 + ... + 155335.

It is an arithmetic number, because the mean of its divisors is an integer number (2044845).

It is the magic constant of a 394 × 394 magic square.

Almost surely, 230581689 is an apocalyptic number.

It is an amenable number.

30581689 is a deficient number, since it is larger than the sum of its proper divisors (2135831).

30581689 is a wasteful number, since it uses less digits than its factorization.

30581689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 30581689 is about 5530.0713376954. The cubic root of 30581689 is about 312.7186787257.

The spelling of 30581689 in words is "thirty million, five hundred eighty-one thousand, six hundred eighty-nine".

Divisors: 1 29 53 101 197 1537 2929 5353 5713 10441 19897 155237 302789 577013 1054541 30581689