681886951 has 4 divisors (see below), whose sum is σ = 696395232. Its totient is φ = 667378672.

The previous prime is 681886927. The next prime is 681886963. The reversal of 681886951 is 159688186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681886951 - 2⁷ = 681886823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681886921) 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, 7254070 + ... + 7254163.

It is an arithmetic number, because the mean of its divisors is an integer number (174098808).

Almost surely, 2^681886951 is an apocalyptic number.

681886951 is a deficient number, since it is larger than the sum of its proper divisors (14508281).

681886951 is a wasteful number, since it uses less digits than its factorization.

681886951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14508280.

The product of its digits is 829440, while the sum is 52.

The square root of 681886951 is about 26112.9651897290. The cubic root of 681886951 is about 880.1785755883.

The spelling of 681886951 in words is "six hundred eighty-one million, eight hundred eighty-six thousand, nine hundred fifty-one".