690410621 has 4 divisors (see below), whose sum is σ = 690537792. Its totient is φ = 690283452.

The previous prime is 690410597. The next prime is 690410629. The reversal of 690410621 is 126014096.

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 690410621 - 2⁶ = 690410557 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 (690410629) 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, 55061 + ... + 66426.

It is an arithmetic number, because the mean of its divisors is an integer number (172634448).

Almost surely, 2^690410621 is an apocalyptic number.

It is an amenable number.

690410621 is a deficient number, since it is larger than the sum of its proper divisors (127171).

690410621 is a wasteful number, since it uses less digits than its factorization.

690410621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127170.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 690410621 is about 26275.6659477928. The cubic root of 690410621 is about 883.8308461483.

The spelling of 690410621 in words is "six hundred ninety million, four hundred ten thousand, six hundred twenty-one".