695869721 has 4 divisors (see below), whose sum is σ = 736803252. Its totient is φ = 654936192.

The previous prime is 695869711. The next prime is 695869739. The reversal of 695869721 is 127968596.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 397444096 + 298425625 = 19936^2 + 17275^2 .

It is a cyclic number.

It is not a de Polignac number, because 695869721 - 2¹⁰ = 695868697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (695869711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20466740 + ... + 20466773.

It is an arithmetic number, because the mean of its divisors is an integer number (184200813).

Almost surely, 2^695869721 is an apocalyptic number.

It is an amenable number.

695869721 is a deficient number, since it is larger than the sum of its proper divisors (40933531).

695869721 is a wasteful number, since it uses less digits than its factorization.

695869721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40933530.

The product of its digits is 1632960, while the sum is 53.

The square root of 695869721 is about 26379.3426946162. The cubic root of 695869721 is about 886.1542265921.

The spelling of 695869721 in words is "six hundred ninety-five million, eight hundred sixty-nine thousand, seven hundred twenty-one".