31115520145 has 16 divisors (see below), whose sum is σ = 39590720640. Its totient is φ = 23410145664.

The previous prime is 31115520119. The next prime is 31115520151. The reversal of 31115520145 is 54102551113.

It is a cyclic number.

It is not a de Polignac number, because 31115520145 - 2⁵ = 31115520113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182357 + ... + 1208386.

It is an arithmetic number, because the mean of its divisors is an integer number (2474420040).

Almost surely, 2^31115520145 is an apocalyptic number.

It is an amenable number.

31115520145 is a deficient number, since it is larger than the sum of its proper divisors (8475200495).

31115520145 is a wasteful number, since it uses less digits than its factorization.

31115520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390904.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 31115520145 in words is "thirty-one billion, one hundred fifteen million, five hundred twenty thousand, one hundred forty-five".