629959681 has 8 divisors (see below), whose sum is σ = 678613544. Its totient is φ = 581333760.

The previous prime is 629959651. The next prime is 629959691. The reversal of 629959681 is 186959926.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 303073281 + 326886400 = 17409^2 + 18080^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 629959681 - 2⁷ = 629959553 is a prime.

It is a super-2 number, since 2×629959681² = 793698399371243522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (629959601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80515 + ... + 87991.

It is an arithmetic number, because the mean of its divisors is an integer number (84826693).

Almost surely, 2^629959681 is an apocalyptic number.

It is an amenable number.

629959681 is a deficient number, since it is larger than the sum of its proper divisors (48653863).

629959681 is a wasteful number, since it uses less digits than its factorization.

629959681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13971.

The product of its digits is 2099520, while the sum is 55.

The square root of 629959681 is about 25098.9976094664. The cubic root of 629959681 is about 857.2436000412.

It can be divided in two parts, 62995968 and 1, that added together give a square (62995969 = 7937²).

The spelling of 629959681 in words is "six hundred twenty-nine million, nine hundred fifty-nine thousand, six hundred eighty-one".