1291088269 has 2 divisors, whose sum is σ = 1291088270. Its totient is φ = 1291088268.

The previous prime is 1291088263. The next prime is 1291088299. The reversal of 1291088269 is 9628801921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 908299044 + 382789225 = 30138^2 + 19565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291088269 - 2²³ = 1282699661 is a prime.

It is a super-2 number, since 2×1291088269² = 3333817836698832722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291088263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645544134 + 645544135.

It is an arithmetic number, because the mean of its divisors is an integer number (645544135).

Almost surely, 2^1291088269 is an apocalyptic number.

It is an amenable number.

1291088269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291088269 is an equidigital number, since it uses as much as digits as its factorization.

1291088269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1291088269 is about 35931.7167555351. The cubic root of 1291088269 is about 1088.8932651732.

The spelling of 1291088269 in words is "one billion, two hundred ninety-one million, eighty-eight thousand, two hundred sixty-nine".