191139937 has 2 divisors, whose sum is σ = 191139938. Its totient is φ = 191139936.

The previous prime is 191139869. The next prime is 191139941. The reversal of 191139937 is 739931191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155151936 + 35988001 = 12456^2 + 5999^2 .

It is an emirp because it is prime and its reverse (739931191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191139937 - 2²⁷ = 56922209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191139893 and 191139902.

It is not a weakly prime, because it can be changed into another prime (191139967) by changing a digit.

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, 95569968 + 95569969.

It is an arithmetic number, because the mean of its divisors is an integer number (95569969).

Almost surely, 2^191139937 is an apocalyptic number.

It is an amenable number.

191139937 is a deficient number, since it is larger than the sum of its proper divisors (1).

191139937 is an equidigital number, since it uses as much as digits as its factorization.

191139937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45927, while the sum is 43.

The square root of 191139937 is about 13825.3367770915. The cubic root of 191139937 is about 576.0371320986.

The spelling of 191139937 in words is "one hundred ninety-one million, one hundred thirty-nine thousand, nine hundred thirty-seven".