621056251 has 2 divisors, whose sum is σ = 621056252. Its totient is φ = 621056250.

The previous prime is 621056239. The next prime is 621056269. The reversal of 621056251 is 152650126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621056251 - 2⁹ = 621055739 is a prime.

It is not a weakly prime, because it can be changed into another prime (621056221) 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 as a sum of consecutive naturals, namely, 310528125 + 310528126.

It is an arithmetic number, because the mean of its divisors is an integer number (310528126).

Almost surely, 2^621056251 is an apocalyptic number.

621056251 is a deficient number, since it is larger than the sum of its proper divisors (1).

621056251 is an equidigital number, since it uses as much as digits as its factorization.

621056251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 621056251 is about 24921.0002006340. Note that the first 3 decimals coincide. The cubic root of 621056251 is about 853.1858533003.

The spelling of 621056251 in words is "six hundred twenty-one million, fifty-six thousand, two hundred fifty-one".