191085137 has 4 divisors (see below), whose sum is σ = 191123520. Its totient is φ = 191046756.

The previous prime is 191085119. The next prime is 191085149. The reversal of 191085137 is 731580191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731580191 = 31 ⋅23599361.

It is a cyclic number.

It is not a de Polignac number, because 191085137 - 2⁶ = 191085073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191085097 and 191085106.

It is not an unprimeable number, because it can be changed into a prime (191085197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10373 + ... + 22130.

It is an arithmetic number, because the mean of its divisors is an integer number (47780880).

Almost surely, 2^191085137 is an apocalyptic number.

It is an amenable number.

191085137 is a deficient number, since it is larger than the sum of its proper divisors (38383).

191085137 is an equidigital number, since it uses as much as digits as its factorization.

191085137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38382.

The product of its (nonzero) digits is 7560, while the sum is 35.

The square root of 191085137 is about 13823.3547664813. The cubic root of 191085137 is about 575.9820767073.

The spelling of 191085137 in words is "one hundred ninety-one million, eighty-five thousand, one hundred thirty-seven".