191455 has 12 divisors (see below), whose sum is σ = 254952. Its totient is φ = 136880.

The previous prime is 191453. The next prime is 191459. The reversal of 191455 is 554191.

It is not a de Polignac number, because 191455 - 2¹ = 191453 is a prime.

It is an Ulam number.

It is a Duffinian number.

Its product of digits (900) is a multiple of the sum of its prime divisors (75).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3216 + ... + 3274.

It is an arithmetic number, because the mean of its divisors is an integer number (21246).

2¹⁹¹⁴⁵⁵ is an apocalyptic number.

191455 is a deficient number, since it is larger than the sum of its proper divisors (63497).

191455 is an equidigital number, since it uses as much as digits as its factorization.

191455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 75 counting only the distinct ones).

The product of its digits is 900, while the sum is 25.

The square root of 191455 is about 437.5557107386. Note that the first 3 decimals coincide. The cubic root of 191455 is about 57.6353459433.

It can be divided in two parts, 191 and 455, that added together give a palindrome (646).

The spelling of 191455 in words is "one hundred ninety-one thousand, four hundred fifty-five".