30913605 has 12 divisors (see below), whose sum is σ = 53583660. Its totient is φ = 16487232.

The previous prime is 30913601. The next prime is 30913607. The reversal of 30913605 is 50631903.

It can be written as a sum of positive squares in 2 ways, for example, as 15539364 + 15374241 = 3942^2 + 3921^2 .

It is not a de Polignac number, because 30913605 - 2² = 30913601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30913601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343440 + ... + 343529.

It is an arithmetic number, because the mean of its divisors is an integer number (4465305).

Almost surely, 2^30913605 is an apocalyptic number.

It is an amenable number.

30913605 is a deficient number, since it is larger than the sum of its proper divisors (22670055).

30913605 is a wasteful number, since it uses less digits than its factorization.

30913605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686980 (or 686977 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 30913605 is about 5560.0004496403. Note that the first 3 decimals coincide. The cubic root of 30913605 is about 313.8459662102.

The spelling of 30913605 in words is "thirty million, nine hundred thirteen thousand, six hundred five".