263172557 has 2 divisors, whose sum is σ = 263172558. Its totient is φ = 263172556.

The previous prime is 263172451. The next prime is 263172571. The reversal of 263172557 is 755271362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255072841 + 8099716 = 15971^2 + 2846^2 .

It is a cyclic number.

It is not a de Polignac number, because 263172557 - 2¹⁸ = 262910413 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263172557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263172577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131586278 + 131586279.

It is an arithmetic number, because the mean of its divisors is an integer number (131586279).

Almost surely, 2^263172557 is an apocalyptic number.

It is an amenable number.

263172557 is a deficient number, since it is larger than the sum of its proper divisors (1).

263172557 is an equidigital number, since it uses as much as digits as its factorization.

263172557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 38.

The square root of 263172557 is about 16222.5940280832. The cubic root of 263172557 is about 640.8359494611.

The spelling of 263172557 in words is "two hundred sixty-three million, one hundred seventy-two thousand, five hundred fifty-seven".