31129113 has 4 divisors (see below), whose sum is σ = 41505488. Its totient is φ = 20752740.

The previous prime is 31129069. The next prime is 31129141. The reversal of 31129113 is 31192113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31129113 - 2⁸ = 31128857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31129113.

It is not an unprimeable number, because it can be changed into a prime (31129013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5188183 + ... + 5188188.

It is an arithmetic number, because the mean of its divisors is an integer number (10376372).

Almost surely, 2^31129113 is an apocalyptic number.

It is an amenable number.

31129113 is a deficient number, since it is larger than the sum of its proper divisors (10376375).

31129113 is a wasteful number, since it uses less digits than its factorization.

31129113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376374.

The product of its digits is 162, while the sum is 21.

The square root of 31129113 is about 5579.3470048026. The cubic root of 31129113 is about 314.5735827551.

The spelling of 31129113 in words is "thirty-one million, one hundred twenty-nine thousand, one hundred thirteen".