627311989 has 2 divisors, whose sum is σ = 627311990. Its totient is φ = 627311988.

The previous prime is 627311977. The next prime is 627312043. The reversal of 627311989 is 989113726.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567249489 + 60062500 = 23817^2 + 7750^2 .

It is a cyclic number.

It is not a de Polignac number, because 627311989 - 2⁵ = 627311957 is a prime.

It is a super-2 number, since 2×627311989² = 787040663086272242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (627311089) 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, 313655994 + 313655995.

It is an arithmetic number, because the mean of its divisors is an integer number (313655995).

Almost surely, 2^627311989 is an apocalyptic number.

It is an amenable number.

627311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

627311989 is an equidigital number, since it uses as much as digits as its factorization.

627311989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 627311989 is about 25046.1970965654. The cubic root of 627311989 is about 856.0409282007.

The spelling of 627311989 in words is "six hundred twenty-seven million, three hundred eleven thousand, nine hundred eighty-nine".