265099987 has 2 divisors, whose sum is σ = 265099988. Its totient is φ = 265099986.

The previous prime is 265099969. The next prime is 265099993. The reversal of 265099987 is 789990562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265099987 - 2¹¹ = 265097939 is a prime.

It is not a weakly prime, because it can be changed into another prime (265099957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132549993 + 132549994.

It is an arithmetic number, because the mean of its divisors is an integer number (132549994).

Almost surely, 2^265099987 is an apocalyptic number.

265099987 is a deficient number, since it is larger than the sum of its proper divisors (1).

265099987 is an equidigital number, since it uses as much as digits as its factorization.

265099987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 265099987 is about 16281.8913827602. The cubic root of 265099987 is about 642.3966026388.

The spelling of 265099987 in words is "two hundred sixty-five million, ninety-nine thousand, nine hundred eighty-seven".