30531998 has 12 divisors (see below), whose sum is σ = 53275392. Its totient is φ = 13085100.

The previous prime is 30531979. The next prime is 30532027. The reversal of 30531998 is 89913503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 155678 + ... + 155873.

It is an arithmetic number, because the mean of its divisors is an integer number (4439616).

Almost surely, 2^30531998 is an apocalyptic number.

30531998 is a deficient number, since it is larger than the sum of its proper divisors (22743394).

30531998 is a wasteful number, since it uses less digits than its factorization.

30531998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311567 (or 311560 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 30531998 is about 5525.5767119822. The cubic root of 30531998 is about 312.5492120897.

The spelling of 30531998 in words is "thirty million, five hundred thirty-one thousand, nine hundred ninety-eight".