30491013 has 32 divisors (see below), whose sum is σ = 49545216. Its totient is φ = 16282368.

The previous prime is 30491009. The next prime is 30491017. The reversal of 30491013 is 31019403.

It is an interprime number because it is at equal distance from previous prime (30491009) and next prime (30491017).

It is not a de Polignac number, because 30491013 - 2² = 30491009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30491017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79420 + ... + 79802.

It is an arithmetic number, because the mean of its divisors is an integer number (1548288).

Almost surely, 2^30491013 is an apocalyptic number.

It is an amenable number.

30491013 is a deficient number, since it is larger than the sum of its proper divisors (19054203).

30491013 is a wasteful number, since it uses less digits than its factorization.

30491013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 30491013 is about 5521.8668038988. The cubic root of 30491013 is about 312.4092980500.

The spelling of 30491013 in words is "thirty million, four hundred ninety-one thousand, thirteen".