261212459 has 2 divisors, whose sum is σ = 261212460. Its totient is φ = 261212458.

The previous prime is 261212453. The next prime is 261212467. The reversal of 261212459 is 954212162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261212459 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261212453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130606229 + 130606230.

It is an arithmetic number, because the mean of its divisors is an integer number (130606230).

Almost surely, 2^261212459 is an apocalyptic number.

261212459 is a deficient number, since it is larger than the sum of its proper divisors (1).

261212459 is an equidigital number, since it uses as much as digits as its factorization.

261212459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 261212459 is about 16162.0685247898. The cubic root of 261212459 is about 639.2410102470.

The spelling of 261212459 in words is "two hundred sixty-one million, two hundred twelve thousand, four hundred fifty-nine".