30998977 has 6 divisors (see below), whose sum is σ = 32032194. Its totient is φ = 29998080.

The previous prime is 30998909. The next prime is 30998987. The reversal of 30998977 is 77989903.

It can be written as a sum of positive squares in only one way, i.e., 23386896 + 7612081 = 4836^2 + 2759^2 .

It is not a de Polignac number, because 30998977 - 2²³ = 22610369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30998987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15168 + ... + 17089.

It is an arithmetic number, because the mean of its divisors is an integer number (5338699).

Almost surely, 2^30998977 is an apocalyptic number.

It is an amenable number.

30998977 is a deficient number, since it is larger than the sum of its proper divisors (1033217).

30998977 is an equidigital number, since it uses as much as digits as its factorization.

30998977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32319 (or 32288 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 30998977 is about 5567.6724939601. The cubic root of 30998977 is about 314.1346096824.

The spelling of 30998977 in words is "thirty million, nine hundred ninety-eight thousand, nine hundred seventy-seven".