731664137 has 2 divisors, whose sum is σ = 731664138. Its totient is φ = 731664136.

The previous prime is 731664119. The next prime is 731664149. The reversal of 731664137 is 731466137.

731664137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657204496 + 74459641 = 25636^2 + 8629^2 .

It is a cyclic number.

It is not a de Polignac number, because 731664137 - 2²⁸ = 463228681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 731664137.

It is not a weakly prime, because it can be changed into another prime (731064137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365832068 + 365832069.

It is an arithmetic number, because the mean of its divisors is an integer number (365832069).

Almost surely, 2^731664137 is an apocalyptic number.

It is an amenable number.

731664137 is a deficient number, since it is larger than the sum of its proper divisors (1).

731664137 is an equidigital number, since it uses as much as digits as its factorization.

731664137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 38.

The square root of 731664137 is about 27049.2908779509. The cubic root of 731664137 is about 901.0950198363.

The spelling of 731664137 in words is "seven hundred thirty-one million, six hundred sixty-four thousand, one hundred thirty-seven".