31279187631 has 8 divisors (see below), whose sum is σ = 41887704880. Its totient is φ = 20761731072.

The previous prime is 31279187623. The next prime is 31279187647. The reversal of 31279187631 is 13678197213.

31279187631 = 11573² + 11574² + ... + 11801².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31279187631 - 2³ = 31279187623 is a prime.

It is a super-2 number, since 2×31279187631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31279187671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22764370 + ... + 22765743.

It is an arithmetic number, because the mean of its divisors is an integer number (5235963110).

Almost surely, 2^31279187631 is an apocalyptic number.

31279187631 is a deficient number, since it is larger than the sum of its proper divisors (10608517249).

31279187631 is a wasteful number, since it uses less digits than its factorization.

31279187631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45530345.

The product of its digits is 381024, while the sum is 48.

The spelling of 31279187631 in words is "thirty-one billion, two hundred seventy-nine million, one hundred eighty-seven thousand, six hundred thirty-one".