621992963 has 4 divisors (see below), whose sum is σ = 622362048. Its totient is φ = 621623880.

The previous prime is 621992947. The next prime is 621992981. The reversal of 621992963 is 369299126.

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 621992963 - 2⁴ = 621992947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621992983) 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, 182003 + ... + 185388.

It is an arithmetic number, because the mean of its divisors is an integer number (155590512).

Almost surely, 2^621992963 is an apocalyptic number.

621992963 is a deficient number, since it is larger than the sum of its proper divisors (369085).

621992963 is a wasteful number, since it uses less digits than its factorization.

621992963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369084.

The product of its digits is 314928, while the sum is 47.

The square root of 621992963 is about 24939.7867472839. The cubic root of 621992963 is about 853.6145788078.

The spelling of 621992963 in words is "six hundred twenty-one million, nine hundred ninety-two thousand, nine hundred sixty-three".