681102857 has 4 divisors (see below), whose sum is σ = 681626880. Its totient is φ = 680578836.

The previous prime is 681102833. The next prime is 681102871. The reversal of 681102857 is 758201186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681102857 - 2⁸ = 681102601 is a prime.

It is a super-2 number, since 2×681102857² = 927802203627124898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681102857.

It is not an unprimeable number, because it can be changed into a prime (681102817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260057 + ... + 262662.

It is an arithmetic number, because the mean of its divisors is an integer number (170406720).

Almost surely, 2^681102857 is an apocalyptic number.

It is an amenable number.

681102857 is a deficient number, since it is larger than the sum of its proper divisors (524023).

681102857 is a wasteful number, since it uses less digits than its factorization.

681102857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524022.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 681102857 is about 26097.9473713930. The cubic root of 681102857 is about 879.8410771035.

The spelling of 681102857 in words is "six hundred eighty-one million, one hundred two thousand, eight hundred fifty-seven".