195815247 has 4 divisors (see below), whose sum is σ = 261087000. Its totient is φ = 130543496.

The previous prime is 195815203. The next prime is 195815281. The reversal of 195815247 is 742518591.

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 195815247 - 2⁶ = 195815183 is a prime.

It is a super-2 number, since 2×195815247² = 76687221915342018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 195815199 and 195815208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195815287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32635872 + ... + 32635877.

It is an arithmetic number, because the mean of its divisors is an integer number (65271750).

Almost surely, 2^195815247 is an apocalyptic number.

195815247 is a deficient number, since it is larger than the sum of its proper divisors (65271753).

195815247 is an equidigital number, since it uses as much as digits as its factorization.

195815247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65271752.

The product of its digits is 100800, while the sum is 42.

The square root of 195815247 is about 13993.4001229151. The cubic root of 195815247 is about 580.6960005724.

It can be divided in two parts, 1958 and 15247, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 195815247 in words is "one hundred ninety-five million, eight hundred fifteen thousand, two hundred forty-seven".