291253253 has 2 divisors, whose sum is σ = 291253254. Its totient is φ = 291253252.

The previous prime is 291253229. The next prime is 291253297. The reversal of 291253253 is 352352192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146724769 + 144528484 = 12113^2 + 12022^2 .

It is a cyclic number.

It is not a de Polignac number, because 291253253 - 2²⁸ = 22817797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291253213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145626626 + 145626627.

It is an arithmetic number, because the mean of its divisors is an integer number (145626627).

Almost surely, 2^291253253 is an apocalyptic number.

It is an amenable number.

291253253 is a deficient number, since it is larger than the sum of its proper divisors (1).

291253253 is an equidigital number, since it uses as much as digits as its factorization.

291253253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 291253253 is about 17066.1434717982. The cubic root of 291253253 is about 662.8627204668.

It can be divided in two parts, 2912 and 53253, that added together give a palindrome (56165).

The spelling of 291253253 in words is "two hundred ninety-one million, two hundred fifty-three thousand, two hundred fifty-three".