681297452 has 12 divisors (see below), whose sum is σ = 1300658856. Its totient is φ = 309680640.

The previous prime is 681297443. The next prime is 681297479. The reversal of 681297452 is 254792186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 15484033 = 681297452 / (6 + 8 + 1 + 2 + 9 + 7 + 4 + 5 + 2).

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, 7741973 + ... + 7742060.

It is an arithmetic number, because the mean of its divisors is an integer number (108388238).

Almost surely, 2^681297452 is an apocalyptic number.

It is an amenable number.

681297452 is a deficient number, since it is larger than the sum of its proper divisors (619361404).

681297452 is a wasteful number, since it uses less digits than its factorization.

681297452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15484048 (or 15484046 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 681297452 is about 26101.6752719054. The cubic root of 681297452 is about 879.9248610087.

The spelling of 681297452 in words is "six hundred eighty-one million, two hundred ninety-seven thousand, four hundred fifty-two".