31120530155 has 32 divisors (see below), whose sum is σ = 43886743488. Its totient is φ = 20885760000.

The previous prime is 31120530127. The next prime is 31120530187. The reversal of 31120530155 is 55103502113.

It is a happy number.

It is not a de Polignac number, because 31120530155 - 2¹⁰ = 31120529131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4441655 + ... + 4448655.

It is an arithmetic number, because the mean of its divisors is an integer number (1371460734).

Almost surely, 2^31120530155 is an apocalyptic number.

31120530155 is a deficient number, since it is larger than the sum of its proper divisors (12766213333).

31120530155 is a wasteful number, since it uses less digits than its factorization.

31120530155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13247.

The product of its (nonzero) digits is 2250, while the sum is 26.

The spelling of 31120530155 in words is "thirty-one billion, one hundred twenty million, five hundred thirty thousand, one hundred fifty-five".