265340991 has 8 divisors (see below), whose sum is σ = 361315584. Its totient is φ = 173130200.

The previous prime is 265340983. The next prime is 265341001. The reversal of 265340991 is 199043562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 265340991 - 2³ = 265340983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265340941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940785 + ... + 941066.

It is an arithmetic number, because the mean of its divisors is an integer number (45164448).

Almost surely, 2^265340991 is an apocalyptic number.

265340991 is a deficient number, since it is larger than the sum of its proper divisors (95974593).

265340991 is a wasteful number, since it uses less digits than its factorization.

265340991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881901.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 265340991 is about 16289.2906843730. The cubic root of 265340991 is about 642.5912125547.

The spelling of 265340991 in words is "two hundred sixty-five million, three hundred forty thousand, nine hundred ninety-one".