251980195 has 8 divisors (see below), whose sum is σ = 302475744. Its totient is φ = 201517824.

The previous prime is 251980189. The next prime is 251980199. The reversal of 251980195 is 591089152.

251980195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251980195 - 2⁵ = 251980163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251980199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13747 + ... + 26323.

It is an arithmetic number, because the mean of its divisors is an integer number (37809468).

Almost surely, 2^251980195 is an apocalyptic number.

251980195 is a deficient number, since it is larger than the sum of its proper divisors (50495549).

251980195 is a wasteful number, since it uses less digits than its factorization.

251980195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16589.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 251980195 is about 15873.8840552651. The cubic root of 251980195 is about 631.6194123081.

The spelling of 251980195 in words is "two hundred fifty-one million, nine hundred eighty thousand, one hundred ninety-five".