681517492 has 12 divisors (see below), whose sum is σ = 1220392096. Its totient is φ = 332834040.

The previous prime is 681517453. The next prime is 681517519. The reversal of 681517492 is 294715186.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980984 + ... + 1981327.

Almost surely, 2^681517492 is an apocalyptic number.

It is an amenable number.

681517492 is a deficient number, since it is larger than the sum of its proper divisors (538874604).

681517492 is a wasteful number, since it uses less digits than its factorization.

681517492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962358 (or 3962356 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 681517492 is about 26105.8899867444. The cubic root of 681517492 is about 880.0195811759.

The spelling of 681517492 in words is "six hundred eighty-one million, five hundred seventeen thousand, four hundred ninety-two".