681397629 has 8 divisors (see below), whose sum is σ = 991123872. Its totient is φ = 412968240.

The previous prime is 681397603. The next prime is 681397643. The reversal of 681397629 is 926793186.

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

It is not a de Polignac number, because 681397629 - 2⁸ = 681397373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681398629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10324174 + ... + 10324239.

It is an arithmetic number, because the mean of its divisors is an integer number (123890484).

Almost surely, 2^681397629 is an apocalyptic number.

It is an amenable number.

681397629 is a deficient number, since it is larger than the sum of its proper divisors (309726243).

681397629 is a wasteful number, since it uses less digits than its factorization.

681397629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20648427.

The product of its digits is 979776, while the sum is 51.

The square root of 681397629 is about 26103.5941778139. The cubic root of 681397629 is about 879.9679865248.

The spelling of 681397629 in words is "six hundred eighty-one million, three hundred ninety-seven thousand, six hundred twenty-nine".