261326711 has 2 divisors, whose sum is σ = 261326712. Its totient is φ = 261326710.

The previous prime is 261326687. The next prime is 261326719. The reversal of 261326711 is 117623162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261326711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261326719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130663355 + 130663356.

It is an arithmetic number, because the mean of its divisors is an integer number (130663356).

Almost surely, 2^261326711 is an apocalyptic number.

261326711 is a deficient number, since it is larger than the sum of its proper divisors (1).

261326711 is an equidigital number, since it uses as much as digits as its factorization.

261326711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 261326711 is about 16165.6027106941. The cubic root of 261326711 is about 639.3341961011.

Adding to 261326711 its reverse (117623162), we get a palindrome (378949873).

The spelling of 261326711 in words is "two hundred sixty-one million, three hundred twenty-six thousand, seven hundred eleven".