30917961 has 12 divisors (see below), whose sum is σ = 44804292. Its totient is φ = 20545056.

The previous prime is 30917941. The next prime is 30917981. The reversal of 30917961 is 16971903.

It is an interprime number because it is at equal distance from previous prime (30917941) and next prime (30917981).

It can be written as a sum of positive squares in 2 ways, for example, as 3825936 + 27092025 = 1956^2 + 5205^2 .

It is not a de Polignac number, because 30917961 - 2⁶ = 30917897 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (30917941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2566 + ... + 8271.

It is an arithmetic number, because the mean of its divisors is an integer number (3733691).

Almost surely, 2^30917961 is an apocalyptic number.

It is an amenable number.

30917961 is a deficient number, since it is larger than the sum of its proper divisors (13886331).

30917961 is a wasteful number, since it uses less digits than its factorization.

30917961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160 (or 11157 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 30917961 is about 5560.3921624288. The cubic root of 30917961 is about 313.8607067408.

It can be divided in two parts, 30917 and 961, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 30917961 in words is "thirty million, nine hundred seventeen thousand, nine hundred sixty-one".