713665621 has 2 divisors, whose sum is σ = 713665622. Its totient is φ = 713665620.

The previous prime is 713665609. The next prime is 713665681. The reversal of 713665621 is 126566317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639533521 + 74132100 = 25289^2 + 8610^2 .

It is an emirp because it is prime and its reverse (126566317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 713665621 - 2⁷ = 713665493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (713665681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356832810 + 356832811.

It is an arithmetic number, because the mean of its divisors is an integer number (356832811).

Almost surely, 2^713665621 is an apocalyptic number.

It is an amenable number.

713665621 is a deficient number, since it is larger than the sum of its proper divisors (1).

713665621 is an equidigital number, since it uses as much as digits as its factorization.

713665621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 713665621 is about 26714.5207892637. The cubic root of 713665621 is about 893.6447852018.

The spelling of 713665621 in words is "seven hundred thirteen million, six hundred sixty-five thousand, six hundred twenty-one".