30811157 has 24 divisors (see below), whose sum is σ = 36103200. Its totient is φ = 26125056.

The previous prime is 30811153. The next prime is 30811169. The reversal of 30811157 is 75111803.

It is not a de Polignac number, because 30811157 - 2² = 30811153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30811153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221594 + ... + 221732.

It is an arithmetic number, because the mean of its divisors is an integer number (1504300).

Almost surely, 2^30811157 is an apocalyptic number.

It is an amenable number.

30811157 is a deficient number, since it is larger than the sum of its proper divisors (5292043).

30811157 is a wasteful number, since it uses less digits than its factorization.

30811157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 30811157 is about 5550.7798551195. The cubic root of 30811157 is about 313.4988862819.

The spelling of 30811157 in words is "thirty million, eight hundred eleven thousand, one hundred fifty-seven".