681892487 has 4 divisors (see below), whose sum is σ = 682182456. Its totient is φ = 681602520.

The previous prime is 681892483. The next prime is 681892507. The reversal of 681892487 is 784298186.

It is a happy number.

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 681892487 - 2² = 681892483 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 (681892483) 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, 141428 + ... + 146169.

It is an arithmetic number, because the mean of its divisors is an integer number (170545614).

Almost surely, 2^681892487 is an apocalyptic number.

681892487 is a deficient number, since it is larger than the sum of its proper divisors (289969).

681892487 is a wasteful number, since it uses less digits than its factorization.

681892487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289968.

The product of its digits is 1548288, while the sum is 53.

The square root of 681892487 is about 26113.0711904977. The cubic root of 681892487 is about 880.1809575351.

The spelling of 681892487 in words is "six hundred eighty-one million, eight hundred ninety-two thousand, four hundred eighty-seven".