1291832587 has 2 divisors, whose sum is σ = 1291832588. Its totient is φ = 1291832586.

The previous prime is 1291832543. The next prime is 1291832599. The reversal of 1291832587 is 7852381921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291832587 - 2¹⁹ = 1291308299 is a prime.

It is a super-2 number, since 2×1291832587² = 3337662865670225138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291832537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645916293 + 645916294.

It is an arithmetic number, because the mean of its divisors is an integer number (645916294).

Almost surely, 2^1291832587 is an apocalyptic number.

1291832587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291832587 is an equidigital number, since it uses as much as digits as its factorization.

1291832587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 1291832587 is about 35942.0726586545. The cubic root of 1291832587 is about 1089.1024755419.

The spelling of 1291832587 in words is "one billion, two hundred ninety-one million, eight hundred thirty-two thousand, five hundred eighty-seven".