265437491 has 4 divisors (see below), whose sum is σ = 289568184. Its totient is φ = 241306800.

The previous prime is 265437481. The next prime is 265437509. The reversal of 265437491 is 194734562.

265437491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265437491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265437421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12065330 + ... + 12065351.

It is an arithmetic number, because the mean of its divisors is an integer number (72392046).

Almost surely, 2^265437491 is an apocalyptic number.

265437491 is a deficient number, since it is larger than the sum of its proper divisors (24130693).

265437491 is a wasteful number, since it uses less digits than its factorization.

265437491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24130692.

The product of its digits is 181440, while the sum is 41.

The square root of 265437491 is about 16292.2524839262. The cubic root of 265437491 is about 642.6691029401.

The spelling of 265437491 in words is "two hundred sixty-five million, four hundred thirty-seven thousand, four hundred ninety-one".