681015542 has 8 divisors (see below), whose sum is σ = 1022198616. Its totient is φ = 340282672.

The previous prime is 681015521. The next prime is 681015551. The reversal of 681015542 is 245510186.

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

It is a junction number, because it is equal to n+sod(n) for n = 681015499 and 681015508.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 108743 + ... + 114834.

It is an arithmetic number, because the mean of its divisors is an integer number (127774827).

Almost surely, 2^681015542 is an apocalyptic number.

681015542 is a deficient number, since it is larger than the sum of its proper divisors (341183074).

681015542 is a wasteful number, since it uses less digits than its factorization.

681015542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225102.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 681015542 is about 26096.2744850678. The cubic root of 681015542 is about 879.8034779823.

The spelling of 681015542 in words is "six hundred eighty-one million, fifteen thousand, five hundred forty-two".