30913091 has 16 divisors (see below), whose sum is σ = 34557408. Its totient is φ = 27417600.

The previous prime is 30913073. The next prime is 30913111. The reversal of 30913091 is 19031903.

It is a cyclic number.

It is not a de Polignac number, because 30913091 - 2¹⁰ = 30912067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30913091.

It is not an unprimeable number, because it can be changed into a prime (30913291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109871 + ... + 110151.

It is an arithmetic number, because the mean of its divisors is an integer number (2159838).

Almost surely, 2^30913091 is an apocalyptic number.

30913091 is a deficient number, since it is larger than the sum of its proper divisors (3644317).

30913091 is a wasteful number, since it uses less digits than its factorization.

30913091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 30913091 is about 5559.9542264303. The cubic root of 30913091 is about 313.8442267633.

Adding to 30913091 its reverse (19031903), we get a palindrome (49944994).

The spelling of 30913091 in words is "thirty million, nine hundred thirteen thousand, ninety-one".