681381873 has 12 divisors (see below), whose sum is σ = 996677760. Its totient is φ = 448504056.

The previous prime is 681381859. The next prime is 681381881. The reversal of 681381873 is 378183186.

It is not a de Polignac number, because 681381873 - 2⁶ = 681381809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681381803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 478461 + ... + 479882.

It is an arithmetic number, because the mean of its divisors is an integer number (83056480).

Almost surely, 2^681381873 is an apocalyptic number.

It is an amenable number.

681381873 is a deficient number, since it is larger than the sum of its proper divisors (315295887).

681381873 is a wasteful number, since it uses less digits than its factorization.

681381873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958428 (or 958425 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 681381873 is about 26103.2923785487. The cubic root of 681381873 is about 879.9612039542.

The spelling of 681381873 in words is "six hundred eighty-one million, three hundred eighty-one thousand, eight hundred seventy-three".