261052195 has 4 divisors (see below), whose sum is σ = 313262640. Its totient is φ = 208841752.

The previous prime is 261052177. The next prime is 261052217. The reversal of 261052195 is 591250162.

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 261052195 - 2⁷ = 261052067 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26105215 + ... + 26105224.

It is an arithmetic number, because the mean of its divisors is an integer number (78315660).

Almost surely, 2^261052195 is an apocalyptic number.

261052195 is a deficient number, since it is larger than the sum of its proper divisors (52210445).

261052195 is an equidigital number, since it uses as much as digits as its factorization.

261052195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52210444.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 261052195 is about 16157.1097353456. The cubic root of 261052195 is about 639.1102504298.

The spelling of 261052195 in words is "two hundred sixty-one million, fifty-two thousand, one hundred ninety-five".