194978331 has 12 divisors (see below), whose sum is σ = 281757840. Its totient is φ = 129929040.

The previous prime is 194978327. The next prime is 194978341. The reversal of 194978331 is 133879491.

It is not a de Polignac number, because 194978331 - 2² = 194978327 is a prime.

It is a super-2 number, since 2×194978331² = 76033099119091122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (194978341) 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, 33186 + ... + 38616.

It is an arithmetic number, because the mean of its divisors is an integer number (23479820).

Almost surely, 2^194978331 is an apocalyptic number.

194978331 is a deficient number, since it is larger than the sum of its proper divisors (86779509).

194978331 is a wasteful number, since it uses less digits than its factorization.

194978331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426 (or 9423 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 194978331 is about 13963.4641475531. The cubic root of 194978331 is about 579.8675192859.

The spelling of 194978331 in words is "one hundred ninety-four million, nine hundred seventy-eight thousand, three hundred thirty-one".