191157 has 4 divisors (see below), whose sum is σ = 254880. Its totient is φ = 127436.

The previous prime is 191143. The next prime is 191161. The reversal of 191157 is 751191.

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.

It is a cyclic number.

It is not a de Polignac number, because 191157 - 2⁴ = 191141 is a prime.

It is a D-number.

191157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191137) 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 in 3 ways as a sum of consecutive naturals, for example, 31857 + ... + 31862.

It is an arithmetic number, because the mean of its divisors is an integer number (63720).

2¹⁹¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

191157 is a deficient number, since it is larger than the sum of its proper divisors (63723).

191157 is an equidigital number, since it uses as much as digits as its factorization.

191157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63722.

The product of its digits is 315, while the sum is 24.

The square root of 191157 is about 437.2150500612. The cubic root of 191157 is about 57.6054272471.

It can be divided in two parts, 19 and 1157, that added together give a triangular number (1176 = T₄₈).

The spelling of 191157 in words is "one hundred ninety-one thousand, one hundred fifty-seven".