194252681 has 4 divisors (see below), whose sum is σ = 222003072. Its totient is φ = 166502292.

The previous prime is 194252677. The next prime is 194252689. The reversal of 194252681 is 186252491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 194252681 - 2² = 194252677 is a prime.

It is a super-2 number, since 2×194252681² = 75468208151375522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194252689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13875185 + ... + 13875198.

It is an arithmetic number, because the mean of its divisors is an integer number (55500768).

Almost surely, 2^194252681 is an apocalyptic number.

It is an amenable number.

194252681 is a deficient number, since it is larger than the sum of its proper divisors (27750391).

194252681 is an equidigital number, since it uses as much as digits as its factorization.

194252681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27750390.

The product of its digits is 34560, while the sum is 38.

The square root of 194252681 is about 13937.4560447737. The cubic root of 194252681 is about 579.1472615504.

The spelling of 194252681 in words is "one hundred ninety-four million, two hundred fifty-two thousand, six hundred eighty-one".