195399051 has 4 divisors (see below), whose sum is σ = 260532072. Its totient is φ = 130266032.

The previous prime is 195399049. The next prime is 195399077. The reversal of 195399051 is 150993591.

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 195399051 - 2¹ = 195399049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195398994 and 195399012.

It is not an unprimeable number, because it can be changed into a prime (195399011) 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, 32566506 + ... + 32566511.

It is an arithmetic number, because the mean of its divisors is an integer number (65133018).

Almost surely, 2^195399051 is an apocalyptic number.

195399051 is a deficient number, since it is larger than the sum of its proper divisors (65133021).

195399051 is an equidigital number, since it uses as much as digits as its factorization.

195399051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65133020.

The product of its (nonzero) digits is 54675, while the sum is 42.

The square root of 195399051 is about 13978.5210591107. The cubic root of 195399051 is about 580.2842948316.

The spelling of 195399051 in words is "one hundred ninety-five million, three hundred ninety-nine thousand, fifty-one".