695671621 has 4 divisors (see below), whose sum is σ = 697567552. Its totient is φ = 693775692.

The previous prime is 695671619. The next prime is 695671631. The reversal of 695671621 is 126176596.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 695671621 - 2¹ = 695671619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (695671631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947415 + ... + 948148.

It is an arithmetic number, because the mean of its divisors is an integer number (174391888).

Almost surely, 2^695671621 is an apocalyptic number.

It is an amenable number.

695671621 is a deficient number, since it is larger than the sum of its proper divisors (1895931).

695671621 is a wasteful number, since it uses less digits than its factorization.

695671621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895930.

The product of its digits is 136080, while the sum is 43.

The square root of 695671621 is about 26375.5875953504. The cubic root of 695671621 is about 886.0701285644.

The spelling of 695671621 in words is "six hundred ninety-five million, six hundred seventy-one thousand, six hundred twenty-one".