195451 has 4 divisors (see below), whose sum is σ = 196504. Its totient is φ = 194400.

The previous prime is 195443. The next prime is 195457. The reversal of 195451 is 154591.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 5-Lehmer number, since φ(195451) divides (195451-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 195451 - 2³ = 195443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195457) 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, 165 + ... + 646.

It is an arithmetic number, because the mean of its divisors is an integer number (49126).

2¹⁹⁵⁴⁵¹ is an apocalyptic number.

195451 is a deficient number, since it is larger than the sum of its proper divisors (1053).

195451 is an equidigital number, since it uses as much as digits as its factorization.

195451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

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

The square root of 195451 is about 442.0984053353. The cubic root of 195451 is about 58.0335715275.

It can be divided in two parts, 195 and 451, that added together give a palindrome (646).

The spelling of 195451 in words is "one hundred ninety-five thousand, four hundred fifty-one".