265421591 has 2 divisors, whose sum is σ = 265421592. Its totient is φ = 265421590.

The previous prime is 265421581. The next prime is 265421599. The reversal of 265421591 is 195124562.

It is a happy number.

265421591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265421591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265421599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132710795 + 132710796.

It is an arithmetic number, because the mean of its divisors is an integer number (132710796).

Almost surely, 2^265421591 is an apocalyptic number.

265421591 is a deficient number, since it is larger than the sum of its proper divisors (1).

265421591 is an equidigital number, since it uses as much as digits as its factorization.

265421591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 265421591 is about 16291.7645146252. The cubic root of 265421591 is about 642.6562704866.

The spelling of 265421591 in words is "two hundred sixty-five million, four hundred twenty-one thousand, five hundred ninety-one".