30998931 has 8 divisors (see below), whose sum is σ = 41370000. Its totient is φ = 20646912.

The previous prime is 30998909. The next prime is 30998987. The reversal of 30998931 is 13989903.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30998931 - 2⁶ = 30998867 is a prime.

It is a super-2 number, since 2×30998931² = 1921867446285522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30998131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 7883.

It is an arithmetic number, because the mean of its divisors is an integer number (5171250).

Almost surely, 2^30998931 is an apocalyptic number.

30998931 is a deficient number, since it is larger than the sum of its proper divisors (10371069).

30998931 is a wasteful number, since it uses less digits than its factorization.

30998931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 30998931 is about 5567.6683629685. The cubic root of 30998931 is about 314.1344542988.

Subtracting from 30998931 its reverse (13989903), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 30998931 in words is "thirty million, nine hundred ninety-eight thousand, nine hundred thirty-one".