191247137 has 2 divisors, whose sum is σ = 191247138. Its totient is φ = 191247136.

The previous prime is 191247131. The next prime is 191247151. The reversal of 191247137 is 731742191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 62742241 = 11336^2 + 7921^2 .

It is an emirp because it is prime and its reverse (731742191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191247137 - 2¹⁰ = 191246113 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 191247097 and 191247106.

It is not a weakly prime, because it can be changed into another prime (191247131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95623568 + 95623569.

It is an arithmetic number, because the mean of its divisors is an integer number (95623569).

Almost surely, 2^191247137 is an apocalyptic number.

It is an amenable number.

191247137 is a deficient number, since it is larger than the sum of its proper divisors (1).

191247137 is an equidigital number, since it uses as much as digits as its factorization.

191247137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 191247137 is about 13829.2131735685. The cubic root of 191247137 is about 576.1448012768.

The spelling of 191247137 in words is "one hundred ninety-one million, two hundred forty-seven thousand, one hundred thirty-seven".