194918131 has 4 divisors (see below), whose sum is σ = 205177000. Its totient is φ = 184659264.

The previous prime is 194918117. The next prime is 194918137. The reversal of 194918131 is 131819491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194918131 is a prime.

It is a super-2 number, since 2×194918131² = 75986155585066322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194918137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5129406 + ... + 5129443.

It is an arithmetic number, because the mean of its divisors is an integer number (51294250).

Almost surely, 2^194918131 is an apocalyptic number.

194918131 is a deficient number, since it is larger than the sum of its proper divisors (10258869).

194918131 is a wasteful number, since it uses less digits than its factorization.

194918131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10258868.

The product of its digits is 7776, while the sum is 37.

The square root of 194918131 is about 13961.3083555948. The cubic root of 194918131 is about 579.8078346742.

The spelling of 194918131 in words is "one hundred ninety-four million, nine hundred eighteen thousand, one hundred thirty-one".