30992971 has 4 divisors (see below), whose sum is σ = 32624200. Its totient is φ = 29361744.

The previous prime is 30992959. The next prime is 30992987. The reversal of 30992971 is 17929903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17929903 = 23 ⋅779561.

It is a cyclic number.

It is not a de Polignac number, because 30992971 - 2¹⁷ = 30861899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30992371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815586 + ... + 815623.

It is an arithmetic number, because the mean of its divisors is an integer number (8156050).

Almost surely, 2^30992971 is an apocalyptic number.

30992971 is a deficient number, since it is larger than the sum of its proper divisors (1631229).

30992971 is a wasteful number, since it uses less digits than its factorization.

30992971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631228.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 30992971 is about 5567.1331042108. The cubic root of 30992971 is about 314.1143206868.

The spelling of 30992971 in words is "thirty million, nine hundred ninety-two thousand, nine hundred seventy-one".