681107409 has 12 divisors (see below), whose sum is σ = 1004754816. Its totient is φ = 444410232.

The previous prime is 681107381. The next prime is 681107411. The reversal of 681107409 is 904701186.

It is not a de Polignac number, because 681107409 - 2⁵ = 681107377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681107489) 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, 804669 + ... + 805514.

It is an arithmetic number, because the mean of its divisors is an integer number (83729568).

Almost surely, 2^681107409 is an apocalyptic number.

It is an amenable number.

681107409 is a deficient number, since it is larger than the sum of its proper divisors (323647407).

681107409 is a wasteful number, since it uses less digits than its factorization.

681107409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610236 (or 1610233 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 681107409 is about 26098.0345811711. The cubic root of 681107409 is about 879.8430371734.

The spelling of 681107409 in words is "six hundred eighty-one million, one hundred seven thousand, four hundred nine".