261213273259 has 2 divisors, whose sum is σ = 261213273260. Its totient is φ = 261213273258.

The previous prime is 261213273179. The next prime is 261213273263. The reversal of 261213273259 is 952372312162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261213273259 - 2¹⁹ = 261212748971 is a prime.

It is not a weakly prime, because it can be changed into another prime (261213273059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130606636629 + 130606636630.

It is an arithmetic number, because the mean of its divisors is an integer number (130606636630).

Almost surely, 2^261213273259 is an apocalyptic number.

261213273259 is a deficient number, since it is larger than the sum of its proper divisors (1).

261213273259 is an equidigital number, since it uses as much as digits as its factorization.

261213273259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The spelling of 261213273259 in words is "two hundred sixty-one billion, two hundred thirteen million, two hundred seventy-three thousand, two hundred fifty-nine".