311140022531 has 16 divisors (see below), whose sum is σ = 337334848704. Its totient is φ = 285269572224.

The previous prime is 311140022509. The next prime is 311140022533. The reversal of 311140022531 is 135220041113.

It is a de Polignac number, because none of the positive numbers 2^k-311140022531 is a prime.

It is a super-2 number, since 2×311140022531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311140022497 and 311140022506.

It is not an unprimeable number, because it can be changed into a prime (311140022533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5681426 + ... + 5735928.

It is an arithmetic number, because the mean of its divisors is an integer number (21083428044).

Almost surely, 2^311140022531 is an apocalyptic number.

311140022531 is a deficient number, since it is larger than the sum of its proper divisors (26194826173).

311140022531 is a wasteful number, since it uses less digits than its factorization.

311140022531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57470.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 311140022531 its reverse (135220041113), we get a palindrome (446360063644).

The spelling of 311140022531 in words is "three hundred eleven billion, one hundred forty million, twenty-two thousand, five hundred thirty-one".