681475251 has 8 divisors (see below), whose sum is σ = 920135680. Its totient is φ = 448565832.

The previous prime is 681475247. The next prime is 681475271. The reversal of 681475251 is 152574186.

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

It is not a de Polignac number, because 681475251 - 2² = 681475247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681475241) 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, 1437475 + ... + 1437948.

It is an arithmetic number, because the mean of its divisors is an integer number (115016960).

Almost surely, 2^681475251 is an apocalyptic number.

681475251 is a deficient number, since it is larger than the sum of its proper divisors (238660429).

681475251 is a wasteful number, since it uses less digits than its factorization.

681475251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875505.

The product of its digits is 67200, while the sum is 39.

The square root of 681475251 is about 26105.0809422227. The cubic root of 681475251 is about 880.0013993607.

The spelling of 681475251 in words is "six hundred eighty-one million, four hundred seventy-five thousand, two hundred fifty-one".