8131943405 has 32 divisors (see below), whose sum is σ = 10248741888. Its totient is φ = 6186585600.

The previous prime is 8131943401. The next prime is 8131943419. The reversal of 8131943405 is 5043491318.

It is not a de Polignac number, because 8131943405 - 2² = 8131943401 is a prime.

It is a super-2 number, since 2×8131943405² (a number of 21 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 (8131943401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3472535 + ... + 3474875.

It is an arithmetic number, because the mean of its divisors is an integer number (320273184).

Almost surely, 2^8131943405 is an apocalyptic number.

It is an amenable number.

8131943405 is a deficient number, since it is larger than the sum of its proper divisors (2116798483).

8131943405 is a wasteful number, since it uses less digits than its factorization.

8131943405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 8131943405 is about 90177.2887427871. The cubic root of 8131943405 is about 2010.9353834707.

The spelling of 8131943405 in words is "eight billion, one hundred thirty-one million, nine hundred forty-three thousand, four hundred five".