1291234505 has 16 divisors (see below), whose sum is σ = 1692054144. Its totient is φ = 938129280.

The previous prime is 1291234501. The next prime is 1291234583. The reversal of 1291234505 is 5054321921.

It is not a de Polignac number, because 1291234505 - 2² = 1291234501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1291234501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45452 + ... + 68178.

It is an arithmetic number, because the mean of its divisors is an integer number (105753384).

Almost surely, 2^1291234505 is an apocalyptic number.

It is an amenable number.

1291234505 is a deficient number, since it is larger than the sum of its proper divisors (400819639).

1291234505 is a wasteful number, since it uses less digits than its factorization.

1291234505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23776.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1291234505 is about 35933.7516132118. The cubic root of 1291234505 is about 1088.9343750358.

The spelling of 1291234505 in words is "one billion, two hundred ninety-one million, two hundred thirty-four thousand, five hundred five".