194925681 has 12 divisors (see below), whose sum is σ = 284143860. Its totient is φ = 128757600.

The previous prime is 194925649. The next prime is 194925707. The reversal of 194925681 is 186529491.

It can be written as a sum of positive squares in 2 ways, for example, as 172029456 + 22896225 = 13116^2 + 4785^2 .

It is not a de Polignac number, because 194925681 - 2⁵ = 194925649 is a prime.

It is a super-2 number, since 2×194925681² = 75992042226627522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194925641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98370 + ... + 100331.

It is an arithmetic number, because the mean of its divisors is an integer number (23678655).

Almost surely, 2^194925681 is an apocalyptic number.

It is an amenable number.

194925681 is a deficient number, since it is larger than the sum of its proper divisors (89218179).

194925681 is a wasteful number, since it uses less digits than its factorization.

194925681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198816 (or 198813 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 194925681 is about 13961.5787431078. The cubic root of 194925681 is about 579.8153207106.

The spelling of 194925681 in words is "one hundred ninety-four million, nine hundred twenty-five thousand, six hundred eighty-one".