715681 has 2 divisors, whose sum is σ = 715682. Its totient is φ = 715680.

The previous prime is 715679. The next prime is 715699. The reversal of 715681 is 186517.

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., 625681 + 90000 = 791^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 715681 - 2¹ = 715679 is a prime.

It is a super-2 number, since 2×715681² = 1024398587522, which contains 22 as substring.

Together with 715679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (715621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357840 + 357841.

It is an arithmetic number, because the mean of its divisors is an integer number (357841).

2⁷¹⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

715681 is a deficient number, since it is larger than the sum of its proper divisors (1).

715681 is an equidigital number, since it uses as much as digits as its factorization.

715681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 715681 is about 845.9793141679. The cubic root of 715681 is about 89.4485206903.

The spelling of 715681 in words is "seven hundred fifteen thousand, six hundred eighty-one".