731688131 has 2 divisors, whose sum is σ = 731688132. Its totient is φ = 731688130.

The previous prime is 731688079. The next prime is 731688203. The reversal of 731688131 is 131886137.

It is a weak prime.

It is an emirp because it is prime and its reverse (131886137) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731688131 is a prime.

It is a super-2 number, since 2×731688131² = 1070735042092546322, which contains 22 as substring.

It is equal to p_37806815 and since 731688131 and 37806815 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (731688631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365844065 + 365844066.

It is an arithmetic number, because the mean of its divisors is an integer number (365844066).

Almost surely, 2^731688131 is an apocalyptic number.

731688131 is a deficient number, since it is larger than the sum of its proper divisors (1).

731688131 is an equidigital number, since it uses as much as digits as its factorization.

731688131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 731688131 is about 27049.7343979567. The cubic root of 731688131 is about 901.1048698191.

The spelling of 731688131 in words is "seven hundred thirty-one million, six hundred eighty-eight thousand, one hundred thirty-one".