5815131721 has 16 divisors (see below), whose sum is σ = 6833933568. Its totient is φ = 4844275200.

The previous prime is 5815131719. The next prime is 5815131727. The reversal of 5815131721 is 1271315185.

It is a cyclic number.

It is not a de Polignac number, because 5815131721 - 2¹ = 5815131719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5815131727) 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, 36961 + ... + 114001.

It is an arithmetic number, because the mean of its divisors is an integer number (427120848).

Almost surely, 2^5815131721 is an apocalyptic number.

It is an amenable number.

5815131721 is a deficient number, since it is larger than the sum of its proper divisors (1018801847).

5815131721 is a wasteful number, since it uses less digits than its factorization.

5815131721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77352.

The product of its digits is 8400, while the sum is 34.

The square root of 5815131721 is about 76257.0109629272. The cubic root of 5815131721 is about 1798.2629044997.

The spelling of 5815131721 in words is "five billion, eight hundred fifteen million, one hundred thirty-one thousand, seven hundred twenty-one".