681395271 has 8 divisors (see below), whose sum is σ = 956344320. Its totient is φ = 430354872.

The previous prime is 681395261. The next prime is 681395279. The reversal of 681395271 is 172593186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-681395271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681395279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5977095 + ... + 5977208.

It is an arithmetic number, because the mean of its divisors is an integer number (119543040).

Almost surely, 2^681395271 is an apocalyptic number.

681395271 is a deficient number, since it is larger than the sum of its proper divisors (274949049).

681395271 is a wasteful number, since it uses less digits than its factorization.

681395271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11954325.

The product of its digits is 90720, while the sum is 42.

The square root of 681395271 is about 26103.5490115808. The cubic root of 681395271 is about 879.9669714704.

The spelling of 681395271 in words is "six hundred eighty-one million, three hundred ninety-five thousand, two hundred seventy-one".