2631991938 has 16 divisors (see below), whose sum is σ = 5264592960. Its totient is φ = 877229136.

The previous prime is 2631991937. The next prime is 2631991951. The reversal of 2631991938 is 8391991362.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2631991933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46428 + ... + 86136.

It is an arithmetic number, because the mean of its divisors is an integer number (329037060).

Almost surely, 2^2631991938 is an apocalyptic number.

2631991938 is an abundant number, since it is smaller than the sum of its proper divisors (2632601022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2631991938 is a wasteful number, since it uses less digits than its factorization.

2631991938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50761.

The product of its digits is 629856, while the sum is 51.

The square root of 2631991938 is about 51302.9427810920. The cubic root of 2631991938 is about 1380.6857786647.

The spelling of 2631991938 in words is "two billion, six hundred thirty-one million, nine hundred ninety-one thousand, nine hundred thirty-eight".