15809541231 has 16 divisors (see below), whose sum is σ = 23737494528. Its totient is φ = 9272457600.

The previous prime is 15809541203. The next prime is 15809541233. The reversal of 15809541231 is 13214590851.

It is not a de Polignac number, because 15809541231 - 2¹⁹ = 15809016943 is a prime.

It is a super-2 number, since 2×15809541231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15809541231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15809541233) 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, 7726026 + ... + 7728071.

It is an arithmetic number, because the mean of its divisors is an integer number (1483593408).

Almost surely, 2^15809541231 is an apocalyptic number.

15809541231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15809541231 is a deficient number, since it is larger than the sum of its proper divisors (7927953297).

15809541231 is a wasteful number, since it uses less digits than its factorization.

15809541231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15454142.

The product of its (nonzero) digits is 43200, while the sum is 39.

It can be divided in two parts, 15809 and 541231, that added together give a triangular number (557040 = T₁₀₅₅).

The spelling of 15809541231 in words is "fifteen billion, eight hundred nine million, five hundred forty-one thousand, two hundred thirty-one".