43131731 has 2 divisors, whose sum is σ = 43131732. Its totient is φ = 43131730.

The previous prime is 43131727. The next prime is 43131749. The reversal of 43131731 is 13713134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43131731 - 2² = 43131727 is a prime.

It is a super-2 number, since 2×43131731² = 3720692438112722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43131697 and 43131706.

It is not a weakly prime, because it can be changed into another prime (43131701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21565865 + 21565866.

It is an arithmetic number, because the mean of its divisors is an integer number (21565866).

Almost surely, 2^43131731 is an apocalyptic number.

43131731 is a deficient number, since it is larger than the sum of its proper divisors (1).

43131731 is an equidigital number, since it uses as much as digits as its factorization.

43131731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 43131731 is about 6567.4752378673. The cubic root of 43131731 is about 350.6971980184.

Adding to 43131731 its reverse (13713134), we get a palindrome (56844865).

The spelling of 43131731 in words is "forty-three million, one hundred thirty-one thousand, seven hundred thirty-one".