681972297 has 16 divisors (see below), whose sum is σ = 926372160. Its totient is φ = 446162112.

The previous prime is 681972283. The next prime is 681972299. The reversal of 681972297 is 792279186.

It is not a de Polignac number, because 681972297 - 2⁴ = 681972281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681972299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47763 + ... + 60375.

It is an arithmetic number, because the mean of its divisors is an integer number (57898260).

Almost surely, 2^681972297 is an apocalyptic number.

681972297 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

681972297 is a deficient number, since it is larger than the sum of its proper divisors (244399863).

681972297 is a wasteful number, since it uses less digits than its factorization.

681972297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12952.

The product of its digits is 762048, while the sum is 51.

The square root of 681972297 is about 26114.5993076670. The cubic root of 681972297 is about 880.2152955494.

The spelling of 681972297 in words is "six hundred eighty-one million, nine hundred seventy-two thousand, two hundred ninety-seven".