261455269 has 2 divisors, whose sum is σ = 261455270. Its totient is φ = 261455268.

The previous prime is 261455263. The next prime is 261455273. The reversal of 261455269 is 962554162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261210244 + 245025 = 16162^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 261455269 - 2³ = 261455261 is a prime.

It is a super-2 number, since 2×261455269² = 136717715375724722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261455261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130727634 + 130727635.

It is an arithmetic number, because the mean of its divisors is an integer number (130727635).

Almost surely, 2^261455269 is an apocalyptic number.

It is an amenable number.

261455269 is a deficient number, since it is larger than the sum of its proper divisors (1).

261455269 is an equidigital number, since it uses as much as digits as its factorization.

261455269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 261455269 is about 16169.5785040922. The cubic root of 261455269 is about 639.4390177005.

The spelling of 261455269 in words is "two hundred sixty-one million, four hundred fifty-five thousand, two hundred sixty-nine".