191381968 has 10 divisors (see below), whose sum is σ = 370802594. Its totient is φ = 95690976.

The previous prime is 191381959. The next prime is 191381977. The reversal of 191381968 is 869183191.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (191381959) and next prime (191381977).

It can be written as a sum of positive squares in only one way, i.e., 145250704 + 46131264 = 12052^2 + 6792^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5980671 + ... + 5980702.

Almost surely, 2^191381968 is an apocalyptic number.

It is an amenable number.

191381968 is a deficient number, since it is larger than the sum of its proper divisors (179420626).

191381968 is a wasteful number, since it uses less digits than its factorization.

191381968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961381 (or 11961375 counting only the distinct ones).

The product of its digits is 93312, while the sum is 46.

The square root of 191381968 is about 13834.0871762469. The cubic root of 191381968 is about 576.2801652750.

The spelling of 191381968 in words is "one hundred ninety-one million, three hundred eighty-one thousand, nine hundred sixty-eight".