263137261 has 2 divisors, whose sum is σ = 263137262. Its totient is φ = 263137260.

The previous prime is 263137247. The next prime is 263137279. The reversal of 263137261 is 162731362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199233225 + 63904036 = 14115^2 + 7994^2 .

It is a cyclic number.

It is not a de Polignac number, because 263137261 - 2¹⁵ = 263104493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263137201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131568630 + 131568631.

It is an arithmetic number, because the mean of its divisors is an integer number (131568631).

Almost surely, 2^263137261 is an apocalyptic number.

It is an amenable number.

263137261 is a deficient number, since it is larger than the sum of its proper divisors (1).

263137261 is an equidigital number, since it uses as much as digits as its factorization.

263137261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 263137261 is about 16221.5061261277. The cubic root of 263137261 is about 640.8072991119.

The spelling of 263137261 in words is "two hundred sixty-three million, one hundred thirty-seven thousand, two hundred sixty-one".