291253591 has 2 divisors, whose sum is σ = 291253592. Its totient is φ = 291253590.

The previous prime is 291253517. The next prime is 291253597. The reversal of 291253591 is 195352192.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 291253591 - 2¹⁵ = 291220823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291253591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291253597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145626795 + 145626796.

It is an arithmetic number, because the mean of its divisors is an integer number (145626796).

Almost surely, 2^291253591 is an apocalyptic number.

291253591 is a deficient number, since it is larger than the sum of its proper divisors (1).

291253591 is an equidigital number, since it uses as much as digits as its factorization.

291253591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 291253591 is about 17066.1533744426. The cubic root of 291253591 is about 662.8629768845.

The spelling of 291253591 in words is "two hundred ninety-one million, two hundred fifty-three thousand, five hundred ninety-one".