191798137 has 2 divisors, whose sum is σ = 191798138. Its totient is φ = 191798136.

The previous prime is 191798119. The next prime is 191798161. The reversal of 191798137 is 731897191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134931456 + 56866681 = 11616^2 + 7541^2 .

It is a cyclic number.

It is not a de Polignac number, because 191798137 - 2¹⁵ = 191765369 is a prime.

It is not a weakly prime, because it can be changed into another prime (191798107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95899068 + 95899069.

It is an arithmetic number, because the mean of its divisors is an integer number (95899069).

Almost surely, 2^191798137 is an apocalyptic number.

It is an amenable number.

191798137 is a deficient number, since it is larger than the sum of its proper divisors (1).

191798137 is an equidigital number, since it uses as much as digits as its factorization.

191798137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 46.

The square root of 191798137 is about 13849.1204413854. The cubic root of 191798137 is about 576.6975788761.

It can be divided in two parts, 19179813 and 7, that multiplied together give a triangular number (134258691 = T₁₆₃₈₆).

The spelling of 191798137 in words is "one hundred ninety-one million, seven hundred ninety-eight thousand, one hundred thirty-seven".