194990631 has 8 divisors (see below), whose sum is σ = 283622784. Its totient is φ = 118176120.

The previous prime is 194990623. The next prime is 194990633. The reversal of 194990631 is 136099491.

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

It is not a de Polignac number, because 194990631 - 2³ = 194990623 is a prime.

It is a super-2 number, since 2×194990631² = 76042692355556322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194990633) 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, 2954371 + ... + 2954436.

It is an arithmetic number, because the mean of its divisors is an integer number (35452848).

Almost surely, 2^194990631 is an apocalyptic number.

194990631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194990631 is a deficient number, since it is larger than the sum of its proper divisors (88632153).

194990631 is a wasteful number, since it uses less digits than its factorization.

194990631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908821.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 194990631 is about 13963.9045757267. The cubic root of 194990631 is about 579.8797124708.

The spelling of 194990631 in words is "one hundred ninety-four million, nine hundred ninety thousand, six hundred thirty-one".