30996581 has 16 divisors (see below), whose sum is σ = 40680960. Its totient is φ = 22880880.

The previous prime is 30996551. The next prime is 30996587. The reversal of 30996581 is 18569903.

It is not a de Polignac number, because 30996581 - 2⁶ = 30996517 is a prime.

It is a super-2 number, since 2×30996581² = 1921576067379122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30996587) 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, 9131 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (2542560).

Almost surely, 2^30996581 is an apocalyptic number.

It is an amenable number.

30996581 is a deficient number, since it is larger than the sum of its proper divisors (9684379).

30996581 is a wasteful number, since it uses less digits than its factorization.

30996581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21224.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 30996581 is about 5567.4573191000. The cubic root of 30996581 is about 314.1265160184.

The spelling of 30996581 in words is "thirty million, nine hundred ninety-six thousand, five hundred eighty-one".