31142261631 has 16 divisors (see below), whose sum is σ = 47347511904. Its totient is φ = 18037146624.

The previous prime is 31142261609. The next prime is 31142261659. The reversal of 31142261631 is 13616224113.

It is not a de Polignac number, because 31142261631 - 2¹¹ = 31142259583 is a prime.

It is a super-2 number, since 2×31142261631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31142261231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23485206 + ... + 23486531.

It is an arithmetic number, because the mean of its divisors is an integer number (2959219494).

Almost surely, 2^31142261631 is an apocalyptic number.

31142261631 is a deficient number, since it is larger than the sum of its proper divisors (16205250273).

31142261631 is a wasteful number, since it uses less digits than its factorization.

31142261631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46971770.

The product of its digits is 5184, while the sum is 30.

Adding to 31142261631 its reverse (13616224113), we get a palindrome (44758485744).

The spelling of 31142261631 in words is "thirty-one billion, one hundred forty-two million, two hundred sixty-one thousand, six hundred thirty-one".