621104961 has 4 divisors (see below), whose sum is σ = 828139952. Its totient is φ = 414069972.

The previous prime is 621104899. The next prime is 621104963. The reversal of 621104961 is 169401126.

It is a happy number.

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 not a de Polignac number, because 621104961 - 2⁷ = 621104833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621104963) 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, 103517491 + ... + 103517496.

It is an arithmetic number, because the mean of its divisors is an integer number (207034988).

Almost surely, 2^621104961 is an apocalyptic number.

It is an amenable number.

621104961 is a deficient number, since it is larger than the sum of its proper divisors (207034991).

621104961 is a wasteful number, since it uses less digits than its factorization.

621104961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207034990.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 621104961 is about 24921.9774696953. The cubic root of 621104961 is about 853.2081580950.

The spelling of 621104961 in words is "six hundred twenty-one million, one hundred four thousand, nine hundred sixty-one".