621257011 has 2 divisors, whose sum is σ = 621257012. Its totient is φ = 621257010.

The previous prime is 621257009. The next prime is 621257057. The reversal of 621257011 is 110752126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621257011 - 2¹ = 621257009 is a prime.

Together with 621257009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (621257311) 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, 310628505 + 310628506.

It is an arithmetic number, because the mean of its divisors is an integer number (310628506).

Almost surely, 2^621257011 is an apocalyptic number.

621257011 is a deficient number, since it is larger than the sum of its proper divisors (1).

621257011 is an equidigital number, since it uses as much as digits as its factorization.

621257011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 621257011 is about 24925.0278033947. The cubic root of 621257011 is about 853.2777758053.

The spelling of 621257011 in words is "six hundred twenty-one million, two hundred fifty-seven thousand, eleven".