265978541 has 4 divisors (see below), whose sum is σ = 266059452. Its totient is φ = 265897632.

The previous prime is 265978507. The next prime is 265978553. The reversal of 265978541 is 145879562.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 167055625 + 98922916 = 12925^2 + 9946^2 .

It is a cyclic number.

It is not a de Polignac number, because 265978541 - 2¹⁴ = 265962157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265978561) 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, 35306 + ... + 42171.

It is an arithmetic number, because the mean of its divisors is an integer number (66514863).

Almost surely, 2^265978541 is an apocalyptic number.

It is an amenable number.

265978541 is a deficient number, since it is larger than the sum of its proper divisors (80911).

265978541 is an equidigital number, since it uses as much as digits as its factorization.

265978541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80910.

The product of its digits is 604800, while the sum is 47.

The square root of 265978541 is about 16308.8485491772. The cubic root of 265978541 is about 643.1054644733.

The spelling of 265978541 in words is "two hundred sixty-five million, nine hundred seventy-eight thousand, five hundred forty-one".