681191432 has 16 divisors (see below), whose sum is σ = 1278296640. Its totient is φ = 340312336.

The previous prime is 681191431. The next prime is 681191449. The reversal of 681191432 is 234191186.

It is a junction number, because it is equal to n+sod(n) for n = 681191392 and 681191401.

It is not an unprimeable number, because it can be changed into a prime (681191431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25028 + ... + 44595.

It is an arithmetic number, because the mean of its divisors is an integer number (79893540).

Almost surely, 2^681191432 is an apocalyptic number.

It is an amenable number.

681191432 is a deficient number, since it is larger than the sum of its proper divisors (597105208).

681191432 is a wasteful number, since it uses less digits than its factorization.

681191432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70852 (or 70848 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 681191432 is about 26099.6442887638. The cubic root of 681191432 is about 879.8792155161.

The spelling of 681191432 in words is "six hundred eighty-one million, one hundred ninety-one thousand, four hundred thirty-two".