681458894 has 4 divisors (see below), whose sum is σ = 1022188344. Its totient is φ = 340729446.

The previous prime is 681458879. The next prime is 681458903. The reversal of 681458894 is 498854186.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170364722 + ... + 170364725.

It is an arithmetic number, because the mean of its divisors is an integer number (255547086).

Almost surely, 2^681458894 is an apocalyptic number.

681458894 is a deficient number, since it is larger than the sum of its proper divisors (340729450).

681458894 is a wasteful number, since it uses less digits than its factorization.

681458894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340729449.

The product of its digits is 2211840, while the sum is 53.

The square root of 681458894 is about 26104.7676488415. The cubic root of 681458894 is about 879.9943586071.

The spelling of 681458894 in words is "six hundred eighty-one million, four hundred fifty-eight thousand, eight hundred ninety-four".