194864561 has 8 divisors (see below), whose sum is σ = 200106984. Its totient is φ = 189688320.

The previous prime is 194864531. The next prime is 194864569. The reversal of 194864561 is 165468491.

It can be written as a sum of positive squares in 4 ways, for example, as 8814961 + 186049600 = 2969^2 + 13640^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194864561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194864569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10550 + ... + 22383.

It is an arithmetic number, because the mean of its divisors is an integer number (25013373).

Almost surely, 2^194864561 is an apocalyptic number.

It is an amenable number.

194864561 is a deficient number, since it is larger than the sum of its proper divisors (5242423).

194864561 is an equidigital number, since it uses as much as digits as its factorization.

194864561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33091.

The product of its digits is 207360, while the sum is 44.

The square root of 194864561 is about 13959.3897072902. The cubic root of 194864561 is about 579.7547129671.

The spelling of 194864561 in words is "one hundred ninety-four million, eight hundred sixty-four thousand, five hundred sixty-one".