681165254 has 32 divisors (see below), whose sum is σ = 1275768576. Its totient is φ = 264993120.

The previous prime is 681165241. The next prime is 681165293. The reversal of 681165254 is 452561186.

It is a happy number.

It is a super-2 number, since 2×681165254² = 927972206513769032, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113657 + ... + 119499.

It is an arithmetic number, because the mean of its divisors is an integer number (39867768).

Almost surely, 2^681165254 is an apocalyptic number.

681165254 is a deficient number, since it is larger than the sum of its proper divisors (594603322).

681165254 is a wasteful number, since it uses less digits than its factorization.

681165254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6620.

The product of its digits is 57600, while the sum is 38.

The square root of 681165254 is about 26099.1427828578. The cubic root of 681165254 is about 879.8679441994.

The spelling of 681165254 in words is "six hundred eighty-one million, one hundred sixty-five thousand, two hundred fifty-four".