261913459 has 2 divisors, whose sum is σ = 261913460. Its totient is φ = 261913458.

The previous prime is 261913433. The next prime is 261913481. The reversal of 261913459 is 954319162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261913459 - 2⁵ = 261913427 is a prime.

It is not a weakly prime, because it can be changed into another prime (261911459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130956729 + 130956730.

It is an arithmetic number, because the mean of its divisors is an integer number (130956730).

Almost surely, 2^261913459 is an apocalyptic number.

261913459 is a deficient number, since it is larger than the sum of its proper divisors (1).

261913459 is an equidigital number, since it uses as much as digits as its factorization.

261913459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 261913459 is about 16183.7405750339. The cubic root of 261913459 is about 639.8123302281.

The spelling of 261913459 in words is "two hundred sixty-one million, nine hundred thirteen thousand, four hundred fifty-nine".