621605077 has 2 divisors, whose sum is σ = 621605078. Its totient is φ = 621605076.

The previous prime is 621605063. The next prime is 621605093. The reversal of 621605077 is 770506126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455865201 + 165739876 = 21351^2 + 12874^2 .

It is a cyclic number.

It is not a de Polignac number, because 621605077 - 2¹¹ = 621603029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621605057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310802538 + 310802539.

It is an arithmetic number, because the mean of its divisors is an integer number (310802539).

Almost surely, 2^621605077 is an apocalyptic number.

It is an amenable number.

621605077 is a deficient number, since it is larger than the sum of its proper divisors (1).

621605077 is an equidigital number, since it uses as much as digits as its factorization.

621605077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 621605077 is about 24932.0090847088. The cubic root of 621605077 is about 853.4370987741.

The spelling of 621605077 in words is "six hundred twenty-one million, six hundred five thousand, seventy-seven".