261295823 has 2 divisors, whose sum is σ = 261295824. Its totient is φ = 261295822.

The previous prime is 261295817. The next prime is 261295849. The reversal of 261295823 is 328592162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261295823 - 2⁶ = 261295759 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261205823) by changing a digit.

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 as a sum of consecutive naturals, namely, 130647911 + 130647912.

It is an arithmetic number, because the mean of its divisors is an integer number (130647912).

Almost surely, 2^261295823 is an apocalyptic number.

261295823 is a deficient number, since it is larger than the sum of its proper divisors (1).

261295823 is an equidigital number, since it uses as much as digits as its factorization.

261295823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 261295823 is about 16164.6473206192. The cubic root of 261295823 is about 639.3090060078.

The spelling of 261295823 in words is "two hundred sixty-one million, two hundred ninety-five thousand, eight hundred twenty-three".