43131623 has 6 divisors (see below), whose sum is σ = 44159904. Its totient is φ = 42126756.

The previous prime is 43131611. The next prime is 43131637. The reversal of 43131623 is 32613134.

It is not a de Polignac number, because 43131623 - 2⁴ = 43131607 is a prime.

It is a super-2 number, since 2×43131623² = 3720673805228258, which 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 (43131643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9815 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (7359984).

Almost surely, 2^43131623 is an apocalyptic number.

43131623 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

43131623 is a deficient number, since it is larger than the sum of its proper divisors (1028281).

43131623 is an equidigital number, since it uses as much as digits as its factorization.

43131623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23413 (or 23370 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

The square root of 43131623 is about 6567.4670155243. The cubic root of 43131623 is about 350.6969053079.

Adding to 43131623 its reverse (32613134), we get a palindrome (75744757).

The spelling of 43131623 in words is "forty-three million, one hundred thirty-one thousand, six hundred twenty-three".