30881956 has 18 divisors (see below), whose sum is σ = 62867238. Its totient is φ = 13235040.

The previous prime is 30881941. The next prime is 30881971. The reversal of 30881956 is 65918803.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30881941) and next prime (30881971).

It can be written as a sum of positive squares in only one way, i.e., 26112100 + 4769856 = 5110^2 + 2184^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78585 + ... + 78976.

Almost surely, 2^30881956 is an apocalyptic number.

It is an amenable number.

30881956 is an abundant number, since it is smaller than the sum of its proper divisors (31985282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30881956 is a wasteful number, since it uses less digits than its factorization.

30881956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157579 (or 157570 counting only the distinct ones).

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

The square root of 30881956 is about 5557.1535879441. The cubic root of 30881956 is about 313.7388256524.

The spelling of 30881956 in words is "thirty million, eight hundred eighty-one thousand, nine hundred fifty-six".