263314721 has 4 divisors (see below), whose sum is σ = 263469444. Its totient is φ = 263160000.

The previous prime is 263314697. The next prime is 263314739. The reversal of 263314721 is 127413362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127413362 = 2 ⋅63706681.

It can be written as a sum of positive squares in 2 ways, for example, as 85359121 + 177955600 = 9239^2 + 13340^2 .

It is a cyclic number.

It is not a de Polignac number, because 263314721 - 2⁶ = 263314657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263314771) 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, 74780 + ... + 78221.

It is an arithmetic number, because the mean of its divisors is an integer number (65867361).

Almost surely, 2^263314721 is an apocalyptic number.

It is an amenable number.

263314721 is a deficient number, since it is larger than the sum of its proper divisors (154723).

263314721 is a wasteful number, since it uses less digits than its factorization.

263314721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154722.

The product of its digits is 6048, while the sum is 29.

The square root of 263314721 is about 16226.9751032039. The cubic root of 263314721 is about 640.9513204092.

The spelling of 263314721 in words is "two hundred sixty-three million, three hundred fourteen thousand, seven hundred twenty-one".