43312131 has 16 divisors (see below), whose sum is σ = 64759200. Its totient is φ = 28607904.

The previous prime is 43312123. The next prime is 43312147. The reversal of 43312131 is 13121334.

It is not a de Polignac number, because 43312131 - 2³ = 43312123 is a prime.

It is a super-2 number, since 2×43312131² = 3751881383522322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43312111) 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, 4416 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (4047450).

Almost surely, 2^43312131 is an apocalyptic number.

43312131 is a deficient number, since it is larger than the sum of its proper divisors (21447069).

43312131 is a wasteful number, since it uses less digits than its factorization.

43312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14835 (or 14829 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 43312131 is about 6581.1952561826. The cubic root of 43312131 is about 351.1854524401.

Adding to 43312131 its reverse (13121334), we get a palindrome (56433465).

The spelling of 43312131 in words is "forty-three million, three hundred twelve thousand, one hundred thirty-one".