265798409 has 2 divisors, whose sum is σ = 265798410. Its totient is φ = 265798408.

The previous prime is 265798381. The next prime is 265798457. The reversal of 265798409 is 904897562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264160009 + 1638400 = 16253^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 265798409 - 2⁸ = 265798153 is a prime.

It is not a weakly prime, because it can be changed into another prime (265794409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132899204 + 132899205.

It is an arithmetic number, because the mean of its divisors is an integer number (132899205).

Almost surely, 2^265798409 is an apocalyptic number.

It is an amenable number.

265798409 is a deficient number, since it is larger than the sum of its proper divisors (1).

265798409 is an equidigital number, since it uses as much as digits as its factorization.

265798409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 265798409 is about 16303.3250902998. The cubic root of 265798409 is about 642.9602522137.

The spelling of 265798409 in words is "two hundred sixty-five million, seven hundred ninety-eight thousand, four hundred nine".