634126621 has 4 divisors (see below), whose sum is σ = 639119872. Its totient is φ = 629133372.

The previous prime is 634126579. The next prime is 634126627. The reversal of 634126621 is 126621436.

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 a de Polignac number, because none of the positive numbers 2^k-634126621 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 (634126627) 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, 2496435 + ... + 2496688.

It is an arithmetic number, because the mean of its divisors is an integer number (159779968).

Almost surely, 2^634126621 is an apocalyptic number.

It is an amenable number.

634126621 is a deficient number, since it is larger than the sum of its proper divisors (4993251).

634126621 is a wasteful number, since it uses less digits than its factorization.

634126621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993250.

The product of its digits is 10368, while the sum is 31.

The square root of 634126621 is about 25181.8708796626. The cubic root of 634126621 is about 859.1295596178.

The spelling of 634126621 in words is "six hundred thirty-four million, one hundred twenty-six thousand, six hundred twenty-one".