731616643 has 2 divisors, whose sum is σ = 731616644. Its totient is φ = 731616642.

The previous prime is 731616581. The next prime is 731616659. The reversal of 731616643 is 346616137.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 731616643 - 2²⁹ = 194745731 is a prime.

It is not a weakly prime, because it can be changed into another prime (731616943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365808321 + 365808322.

It is an arithmetic number, because the mean of its divisors is an integer number (365808322).

Almost surely, 2^731616643 is an apocalyptic number.

731616643 is a deficient number, since it is larger than the sum of its proper divisors (1).

731616643 is an equidigital number, since it uses as much as digits as its factorization.

731616643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 37.

The square root of 731616643 is about 27048.4129478977. The cubic root of 731616643 is about 901.0755220318.

The spelling of 731616643 in words is "seven hundred thirty-one million, six hundred sixteen thousand, six hundred forty-three".