261092791 has 2 divisors, whose sum is σ = 261092792. Its totient is φ = 261092790.

The previous prime is 261092789. The next prime is 261092807. The reversal of 261092791 is 197290162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261092791 - 2¹ = 261092789 is a prime.

Together with 261092789, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 261092791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261092701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130546395 + 130546396.

It is an arithmetic number, because the mean of its divisors is an integer number (130546396).

Almost surely, 2^261092791 is an apocalyptic number.

261092791 is a deficient number, since it is larger than the sum of its proper divisors (1).

261092791 is an equidigital number, since it uses as much as digits as its factorization.

261092791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 261092791 is about 16158.3659755558. The cubic root of 261092791 is about 639.1433778725.

It can be divided in two parts, 26109 and 2791, that added together give a square (28900 = 170²).

The spelling of 261092791 in words is "two hundred sixty-one million, ninety-two thousand, seven hundred ninety-one".