291075121 has 2 divisors, whose sum is σ = 291075122. Its totient is φ = 291075120.

The previous prime is 291075091. The next prime is 291075137. The reversal of 291075121 is 121570192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171479025 + 119596096 = 13095^2 + 10936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291075121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291075121.

It is not a weakly prime, because it can be changed into another prime (291075721) 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, 145537560 + 145537561.

It is an arithmetic number, because the mean of its divisors is an integer number (145537561).

Almost surely, 2^291075121 is an apocalyptic number.

It is an amenable number.

291075121 is a deficient number, since it is larger than the sum of its proper divisors (1).

291075121 is an equidigital number, since it uses as much as digits as its factorization.

291075121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 291075121 is about 17060.9238026550. The cubic root of 291075121 is about 662.7275561481.

The spelling of 291075121 in words is "two hundred ninety-one million, seventy-five thousand, one hundred twenty-one".