695491721 has 2 divisors, whose sum is σ = 695491722. Its totient is φ = 695491720.

The previous prime is 695491711. The next prime is 695491739. The reversal of 695491721 is 127194596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 495552121 + 199939600 = 22261^2 + 14140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-695491721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (695491711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347745860 + 347745861.

It is an arithmetic number, because the mean of its divisors is an integer number (347745861).

Almost surely, 2^695491721 is an apocalyptic number.

It is an amenable number.

695491721 is a deficient number, since it is larger than the sum of its proper divisors (1).

695491721 is an equidigital number, since it uses as much as digits as its factorization.

695491721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 695491721 is about 26372.1770242807. The cubic root of 695491721 is about 885.9937430237.

The spelling of 695491721 in words is "six hundred ninety-five million, four hundred ninety-one thousand, seven hundred twenty-one".