30997813 has 24 divisors (see below), whose sum is σ = 40453056. Its totient is φ = 23073600.

The previous prime is 30997807. The next prime is 30997829. The reversal of 30997813 is 31879903.

It is not a de Polignac number, because 30997813 - 2⁹ = 30997301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30997843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40353 + ... + 41113.

It is an arithmetic number, because the mean of its divisors is an integer number (1685544).

Almost surely, 2^30997813 is an apocalyptic number.

It is an amenable number.

30997813 is a deficient number, since it is larger than the sum of its proper divisors (9455243).

30997813 is a wasteful number, since it uses less digits than its factorization.

30997813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 30997813 is about 5567.5679609682. The cubic root of 30997813 is about 314.1306777541.

The spelling of 30997813 in words is "thirty million, nine hundred ninety-seven thousand, eight hundred thirteen".