191457 has 16 divisors (see below), whose sum is σ = 324480. Its totient is φ = 109296.

The previous prime is 191453. The next prime is 191459. The reversal of 191457 is 754191.

It is not a de Polignac number, because 191457 - 2² = 191453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

191457 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 191457.

It is not an unprimeable number, because it can be changed into a prime (191453) 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 15 ways as a sum of consecutive naturals, for example, 318 + ... + 695.

It is an arithmetic number, because the mean of its divisors is an integer number (20280).

2¹⁹¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

191457 is a deficient number, since it is larger than the sum of its proper divisors (133023).

191457 is a wasteful number, since it uses less digits than its factorization.

191457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1023 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 191457 is about 437.5579961559. The cubic root of 191457 is about 57.6355466350.

The spelling of 191457 in words is "one hundred ninety-one thousand, four hundred fifty-seven".