629977681 has 2 divisors, whose sum is σ = 629977682. Its totient is φ = 629977680.

The previous prime is 629977639. The next prime is 629977693. The reversal of 629977681 is 186779926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485761600 + 144216081 = 22040^2 + 12009^2 .

It is a cyclic number.

It is not a de Polignac number, because 629977681 - 2¹³ = 629969489 is a prime.

It is a super-2 number, since 2×629977681² = 793743757116275522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (629977631) 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, 314988840 + 314988841.

It is an arithmetic number, because the mean of its divisors is an integer number (314988841).

Almost surely, 2^629977681 is an apocalyptic number.

It is an amenable number.

629977681 is a deficient number, since it is larger than the sum of its proper divisors (1).

629977681 is an equidigital number, since it uses as much as digits as its factorization.

629977681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 55.

The square root of 629977681 is about 25099.3561869622. The cubic root of 629977681 is about 857.2517647107.

The spelling of 629977681 in words is "six hundred twenty-nine million, nine hundred seventy-seven thousand, six hundred eighty-one".