31231310123011 has 4 divisors (see below), whose sum is σ = 32875063287400. Its totient is φ = 29587556958624.

The previous prime is 31231310123003. The next prime is 31231310123023. The reversal of 31231310123011 is 11032101313213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31231310123011 - 2³ = 31231310123003 is a prime.

It is a super-2 number, since 2×31231310123011² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231310123051) 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, 821876582166 + ... + 821876582203.

It is an arithmetic number, because the mean of its divisors is an integer number (8218765821850).

Almost surely, 2^{31231310123011} is an apocalyptic number.

31231310123011 is a deficient number, since it is larger than the sum of its proper divisors (1643753164389).

31231310123011 is a wasteful number, since it uses less digits than its factorization.

31231310123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643753164388.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31231310123011 its reverse (11032101313213), we get a palindrome (42263411436224).

The spelling of 31231310123011 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred ten million, one hundred twenty-three thousand, eleven".