265049989 has 2 divisors, whose sum is σ = 265049990. Its totient is φ = 265049988.

The previous prime is 265049987. The next prime is 265050017. The reversal of 265049989 is 989940562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147501025 + 117548964 = 12145^2 + 10842^2 .

It is a cyclic number.

It is not a de Polignac number, because 265049989 - 2¹ = 265049987 is a prime.

Together with 265049987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265049987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132524994 + 132524995.

It is an arithmetic number, because the mean of its divisors is an integer number (132524995).

Almost surely, 2^265049989 is an apocalyptic number.

It is an amenable number.

265049989 is a deficient number, since it is larger than the sum of its proper divisors (1).

265049989 is an equidigital number, since it uses as much as digits as its factorization.

265049989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 265049989 is about 16280.3559236277. The cubic root of 265049989 is about 642.3562146515.

The spelling of 265049989 in words is "two hundred sixty-five million, forty-nine thousand, nine hundred eighty-nine".