621117977 has 2 divisors, whose sum is σ = 621117978. Its totient is φ = 621117976.

The previous prime is 621117943. The next prime is 621118031. The reversal of 621117977 is 779711126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619960201 + 1157776 = 24899^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 621117977 - 2¹⁰ = 621116953 is a prime.

It is not a weakly prime, because it can be changed into another prime (621117577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310558988 + 310558989.

It is an arithmetic number, because the mean of its divisors is an integer number (310558989).

Almost surely, 2^621117977 is an apocalyptic number.

It is an amenable number.

621117977 is a deficient number, since it is larger than the sum of its proper divisors (1).

621117977 is an equidigital number, since it uses as much as digits as its factorization.

621117977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 41.

The square root of 621117977 is about 24922.2386033037. The cubic root of 621117977 is about 853.2141180537.

The spelling of 621117977 in words is "six hundred twenty-one million, one hundred seventeen thousand, nine hundred seventy-seven".