195251 has 4 divisors (see below), whose sum is σ = 223152. Its totient is φ = 167352.

The previous prime is 195241. The next prime is 195253. The reversal of 195251 is 152591.

195251 = 164² + 165² + ... + 170².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152591 = 331 ⋅461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195253) 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, 13940 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (55788).

2¹⁹⁵²⁵¹ is an apocalyptic number.

195251 is a deficient number, since it is larger than the sum of its proper divisors (27901).

195251 is an equidigital number, since it uses as much as digits as its factorization.

195251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27900.

The product of its digits is 450, while the sum is 23.

The square root of 195251 is about 441.8721534562. The cubic root of 195251 is about 58.0137700163.

The spelling of 195251 in words is "one hundred ninety-five thousand, two hundred fifty-one".