291282881 has 2 divisors, whose sum is σ = 291282882. Its totient is φ = 291282880.

The previous prime is 291282857. The next prime is 291282883. The reversal of 291282881 is 188282192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270306481 + 20976400 = 16441^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 291282881 - 2¹⁰ = 291281857 is a prime.

It is a super-2 number, since 2×291282881² = 169691433527320322, which contains 22 as substring.

Together with 291282883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291282883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145641440 + 145641441.

It is an arithmetic number, because the mean of its divisors is an integer number (145641441).

Almost surely, 2^291282881 is an apocalyptic number.

It is an amenable number.

291282881 is a deficient number, since it is larger than the sum of its proper divisors (1).

291282881 is an equidigital number, since it uses as much as digits as its factorization.

291282881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 291282881 is about 17067.0114841468. The cubic root of 291282881 is about 662.8851964741.

The spelling of 291282881 in words is "two hundred ninety-one million, two hundred eighty-two thousand, eight hundred eighty-one".