715789621 has 2 divisors, whose sum is σ = 715789622. Its totient is φ = 715789620.

The previous prime is 715789619. The next prime is 715789631. The reversal of 715789621 is 126987517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640343025 + 75446596 = 25305^2 + 8686^2 .

It is a cyclic number.

It is not a de Polignac number, because 715789621 - 2¹ = 715789619 is a prime.

Together with 715789619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715789631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357894810 + 357894811.

It is an arithmetic number, because the mean of its divisors is an integer number (357894811).

Almost surely, 2^715789621 is an apocalyptic number.

It is an amenable number.

715789621 is a deficient number, since it is larger than the sum of its proper divisors (1).

715789621 is an equidigital number, since it uses as much as digits as its factorization.

715789621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 46.

The square root of 715789621 is about 26754.2449155270. The cubic root of 715789621 is about 894.5304574935.

The spelling of 715789621 in words is "seven hundred fifteen million, seven hundred eighty-nine thousand, six hundred twenty-one".