31312845 has 16 divisors (see below), whose sum is σ = 55667520. Its totient is φ = 16700112.

The previous prime is 31312823. The next prime is 31312847. The reversal of 31312845 is 54821313.

It is a happy number.

It is not a de Polignac number, because 31312845 - 2¹⁰ = 31311821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115839 + ... + 116108.

It is an arithmetic number, because the mean of its divisors is an integer number (3479220).

Almost surely, 2^31312845 is an apocalyptic number.

It is an amenable number.

31312845 is a deficient number, since it is larger than the sum of its proper divisors (24354675).

31312845 is a wasteful number, since it uses less digits than its factorization.

31312845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231961 (or 231955 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 31312845 is about 5595.7881482415. The cubic root of 31312845 is about 315.1912670597.

The spelling of 31312845 in words is "thirty-one million, three hundred twelve thousand, eight hundred forty-five".