681487089 has 4 divisors (see below), whose sum is σ = 908649456. Its totient is φ = 454324724.

The previous prime is 681487073. The next prime is 681487099. The reversal of 681487089 is 980784186.

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 681487089 - 2⁴ = 681487073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681487019) 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, 113581179 + ... + 113581184.

It is an arithmetic number, because the mean of its divisors is an integer number (227162364).

Almost surely, 2^681487089 is an apocalyptic number.

It is an amenable number.

681487089 is a deficient number, since it is larger than the sum of its proper divisors (227162367).

681487089 is a wasteful number, since it uses less digits than its factorization.

681487089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227162366.

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 681487089 is about 26105.3076787078. The cubic root of 681487089 is about 880.0064948729.

The spelling of 681487089 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, eighty-nine".