291255121 has 2 divisors, whose sum is σ = 291255122. Its totient is φ = 291255120.

The previous prime is 291255119. The next prime is 291255131. The reversal of 291255121 is 121552192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244140625 + 47114496 = 15625^2 + 6864^2 .

It is a cyclic number.

It is not a de Polignac number, because 291255121 - 2¹ = 291255119 is a prime.

Together with 291255119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 291255121.

It is not a weakly prime, because it can be changed into another prime (291255131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145627560 + 145627561.

It is an arithmetic number, because the mean of its divisors is an integer number (145627561).

Almost surely, 2^291255121 is an apocalyptic number.

It is an amenable number.

291255121 is a deficient number, since it is larger than the sum of its proper divisors (1).

291255121 is an equidigital number, since it uses as much as digits as its factorization.

291255121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 291255121 is about 17066.1981999507. The cubic root of 291255121 is about 662.8641375896.

The spelling of 291255121 in words is "two hundred ninety-one million, two hundred fifty-five thousand, one hundred twenty-one".