621522051 has 4 divisors (see below), whose sum is σ = 828696072. Its totient is φ = 414348032.

The previous prime is 621522047. The next prime is 621522071. The reversal of 621522051 is 150225126.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 621522051 - 2² = 621522047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621522071) 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, 103587006 + ... + 103587011.

It is an arithmetic number, because the mean of its divisors is an integer number (207174018).

Almost surely, 2^621522051 is an apocalyptic number.

621522051 is a deficient number, since it is larger than the sum of its proper divisors (207174021).

621522051 is a wasteful number, since it uses less digits than its factorization.

621522051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207174020.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 621522051 is about 24930.3439807797. The cubic root of 621522051 is about 853.3991000371.

Adding to 621522051 its reverse (150225126), we get a palindrome (771747177).

The spelling of 621522051 in words is "six hundred twenty-one million, five hundred twenty-two thousand, fifty-one".