681007051 has 8 divisors (see below), whose sum is σ = 683862704. Its totient is φ = 678157920.

The previous prime is 681007049. The next prime is 681007073. The reversal of 681007051 is 150700186.

It is a happy number.

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 681007051 - 2¹ = 681007049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681007001) 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, 337636 + ... + 339646.

It is an arithmetic number, because the mean of its divisors is an integer number (85482838).

Almost surely, 2^681007051 is an apocalyptic number.

681007051 is a deficient number, since it is larger than the sum of its proper divisors (2855653).

681007051 is a wasteful number, since it uses less digits than its factorization.

681007051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 681007051 is about 26096.1117985036. Note that the first 3 decimals coincide. The cubic root of 681007051 is about 879.7998214615.

The spelling of 681007051 in words is "six hundred eighty-one million, seven thousand, fifty-one".