681296387 has 4 divisors (see below), whose sum is σ = 683318376. Its totient is φ = 679274400.

The previous prime is 681296383. The next prime is 681296431. The reversal of 681296387 is 783692186.

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 681296387 - 2² = 681296383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681296381) 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, 1010489 + ... + 1011162.

It is an arithmetic number, because the mean of its divisors is an integer number (170829594).

Almost surely, 2^681296387 is an apocalyptic number.

681296387 is a deficient number, since it is larger than the sum of its proper divisors (2021989).

681296387 is a wasteful number, since it uses less digits than its factorization.

681296387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021988.

The product of its digits is 870912, while the sum is 50.

The square root of 681296387 is about 26101.6548709081. The cubic root of 681296387 is about 879.9244025107.

The spelling of 681296387 in words is "six hundred eighty-one million, two hundred ninety-six thousand, three hundred eighty-seven".