30491913 has 8 divisors (see below), whose sum is σ = 40785408. Its totient is φ = 20263184.

The previous prime is 30491911. The next prime is 30491933. The reversal of 30491913 is 31919403.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30491913 - 2¹ = 30491911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30491911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15081 + ... + 16982.

It is an arithmetic number, because the mean of its divisors is an integer number (5098176).

Almost surely, 2^30491913 is an apocalyptic number.

It is an amenable number.

30491913 is a deficient number, since it is larger than the sum of its proper divisors (10293495).

30491913 is a wasteful number, since it uses less digits than its factorization.

30491913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32383.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 30491913 is about 5521.9482974762. The cubic root of 30491913 is about 312.4123718038.

The spelling of 30491913 in words is "thirty million, four hundred ninety-one thousand, nine hundred thirteen".