43131031 has 2 divisors, whose sum is σ = 43131032. Its totient is φ = 43131030.

The previous prime is 43130987. The next prime is 43131037. The reversal of 43131031 is 13013134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43131031 - 2⁹ = 43130519 is a prime.

It is a super-2 number, since 2×43131031² = 3720571670245922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43130996 and 43131014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43131037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21565515 + 21565516.

It is an arithmetic number, because the mean of its divisors is an integer number (21565516).

Almost surely, 2^43131031 is an apocalyptic number.

43131031 is a deficient number, since it is larger than the sum of its proper divisors (1).

43131031 is an equidigital number, since it uses as much as digits as its factorization.

43131031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 43131031 is about 6567.4219447208. The cubic root of 43131031 is about 350.6953008122.

Adding to 43131031 its reverse (13013134), we get a palindrome (56144165).

The spelling of 43131031 in words is "forty-three million, one hundred thirty-one thousand, thirty-one".