681385453 has 8 divisors (see below), whose sum is σ = 778930880. Its totient is φ = 583891200.

The previous prime is 681385447. The next prime is 681385457. The reversal of 681385453 is 354583186.

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 681385453 - 2²¹ = 679288301 is a prime.

It is a super-2 number, since 2×681385453² = 928572271120030418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681385457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22093 + ... + 43021.

It is an arithmetic number, because the mean of its divisors is an integer number (97366360).

Almost surely, 2^681385453 is an apocalyptic number.

It is an amenable number.

681385453 is a deficient number, since it is larger than the sum of its proper divisors (97545427).

681385453 is a wasteful number, since it uses less digits than its factorization.

681385453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25587.

The product of its digits is 345600, while the sum is 43.

The square root of 681385453 is about 26103.3609521839. The cubic root of 681385453 is about 879.9627450654.

The spelling of 681385453 in words is "six hundred eighty-one million, three hundred eighty-five thousand, four hundred fifty-three".