696721 has 2 divisors, whose sum is σ = 696722. Its totient is φ = 696720.

The previous prime is 696719. The next prime is 696737. The reversal of 696721 is 127696.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 261121 = 660^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 696721 - 2¹ = 696719 is a prime.

Together with 696719, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (690721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348360 + 348361.

It is an arithmetic number, because the mean of its divisors is an integer number (348361).

2⁶⁹⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

696721 is a deficient number, since it is larger than the sum of its proper divisors (1).

696721 is an equidigital number, since it uses as much as digits as its factorization.

696721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 696721 is about 834.6981490335. The cubic root of 696721 is about 88.6515432652.

The spelling of 696721 in words is "six hundred ninety-six thousand, seven hundred twenty-one".