195039251 has 4 divisors (see below), whose sum is σ = 212770104. Its totient is φ = 177308400.

The previous prime is 195039217. The next prime is 195039269. The reversal of 195039251 is 152930591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195039251 - 2¹⁰ = 195038227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195039151) 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, 8865410 + ... + 8865431.

It is an arithmetic number, because the mean of its divisors is an integer number (53192526).

Almost surely, 2^195039251 is an apocalyptic number.

195039251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195039251 is a deficient number, since it is larger than the sum of its proper divisors (17730853).

195039251 is a wasteful number, since it uses less digits than its factorization.

195039251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17730852.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 195039251 is about 13965.6453842993. The cubic root of 195039251 is about 579.9279052284.

The spelling of 195039251 in words is "one hundred ninety-five million, thirty-nine thousand, two hundred fifty-one".