194117545 has 4 divisors (see below), whose sum is σ = 232941060. Its totient is φ = 155294032.

The previous prime is 194117537. The next prime is 194117557. The reversal of 194117545 is 545711491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545711491 = 13 ⋅41977807.

It can be written as a sum of positive squares in 2 ways, for example, as 152695449 + 41422096 = 12357^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 194117545 - 2³ = 194117537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19411750 + ... + 19411759.

It is an arithmetic number, because the mean of its divisors is an integer number (58235265).

Almost surely, 2^194117545 is an apocalyptic number.

It is an amenable number.

194117545 is a deficient number, since it is larger than the sum of its proper divisors (38823515).

194117545 is an equidigital number, since it uses as much as digits as its factorization.

194117545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38823514.

The product of its digits is 25200, while the sum is 37.

The square root of 194117545 is about 13932.6072577964. The cubic root of 194117545 is about 579.0129317014.

The spelling of 194117545 in words is "one hundred ninety-four million, one hundred seventeen thousand, five hundred forty-five".