681473399 has 8 divisors (see below), whose sum is σ = 717699840. Its totient is φ = 645282936.

The previous prime is 681473389. The next prime is 681473411. The reversal of 681473399 is 993374186.

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

It is a cyclic number.

It is not a de Polignac number, because 681473399 - 2⁴ = 681473383 is a prime.

It is a super-2 number, since 2×681473399² = 928811987089226402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681473329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35612 + ... + 51294.

It is an arithmetic number, because the mean of its divisors is an integer number (89712480).

Almost surely, 2^681473399 is an apocalyptic number.

681473399 is a deficient number, since it is larger than the sum of its proper divisors (36226441).

681473399 is a wasteful number, since it uses less digits than its factorization.

681473399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17989.

The product of its digits is 979776, while the sum is 50.

The square root of 681473399 is about 26105.0454701768. The cubic root of 681473399 is about 880.0006021862. Note that the first 3 decimals are identical.

The spelling of 681473399 in words is "six hundred eighty-one million, four hundred seventy-three thousand, three hundred ninety-nine".