265313861 has 2 divisors, whose sum is σ = 265313862. Its totient is φ = 265313860.

The previous prime is 265313857. The next prime is 265313863. The reversal of 265313861 is 168313562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249829636 + 15484225 = 15806^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 265313861 - 2² = 265313857 is a prime.

It is a Sophie Germain prime.

Together with 265313863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265313863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132656930 + 132656931.

It is an arithmetic number, because the mean of its divisors is an integer number (132656931).

Almost surely, 2^265313861 is an apocalyptic number.

It is an amenable number.

265313861 is a deficient number, since it is larger than the sum of its proper divisors (1).

265313861 is an equidigital number, since it uses as much as digits as its factorization.

265313861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 265313861 is about 16288.4579073650. The cubic root of 265313861 is about 642.5693110589.

The spelling of 265313861 in words is "two hundred sixty-five million, three hundred thirteen thousand, eight hundred sixty-one".