2159723631 has 16 divisors (see below), whose sum is σ = 3130130304. Its totient is φ = 1316637024.

The previous prime is 2159723617. The next prime is 2159723677. The reversal of 2159723631 is 1363279512.

It is a happy number.

It is not a de Polignac number, because 2159723631 - 2¹⁷ = 2159592559 is a prime.

It is a super-2 number, since 2×2159723631² = 9328812324599648322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 2159723631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159723611) 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, 254601 + ... + 262946.

It is an arithmetic number, because the mean of its divisors is an integer number (195633144).

Almost surely, 2^2159723631 is an apocalyptic number.

2159723631 is a deficient number, since it is larger than the sum of its proper divisors (970406673).

2159723631 is a wasteful number, since it uses less digits than its factorization.

2159723631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517670.

The product of its digits is 68040, while the sum is 39.

The square root of 2159723631 is about 46472.8268023369. The cubic root of 2159723631 is about 1292.6056802824.

The spelling of 2159723631 in words is "two billion, one hundred fifty-nine million, seven hundred twenty-three thousand, six hundred thirty-one".