31145311235155 has 16 divisors (see below), whose sum is σ = 40253397053184. Its totient is φ = 22997287728000.

The previous prime is 31145311235141. The next prime is 31145311235179. The reversal of 31145311235155 is 55153211354113.

It is not a de Polignac number, because 31145311235155 - 2¹¹ = 31145311233107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23589096 + ... + 24874405.

It is an arithmetic number, because the mean of its divisors is an integer number (2515837315824).

Almost surely, 2^{31145311235155} is an apocalyptic number.

31145311235155 is a deficient number, since it is larger than the sum of its proper divisors (9108085818029).

31145311235155 is a wasteful number, since it uses less digits than its factorization.

31145311235155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48473406.

The product of its digits is 135000, while the sum is 40.

Adding to 31145311235155 its reverse (55153211354113), we get a palindrome (86298522589268).

The spelling of 31145311235155 in words is "thirty-one trillion, one hundred forty-five billion, three hundred eleven million, two hundred thirty-five thousand, one hundred fifty-five".