1291242920559 has 32 divisors (see below), whose sum is σ = 1741705127424. Its totient is φ = 850865134080.

The previous prime is 1291242920479. The next prime is 1291242920621. The reversal of 1291242920559 is 9550292421921.

It is not a de Polignac number, because 1291242920559 - 2²¹ = 1291240823407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291242920059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126450964 + ... + 126461174.

It is an arithmetic number, because the mean of its divisors is an integer number (54428285232).

Almost surely, 2^{1291242920559} is an apocalyptic number.

1291242920559 is a deficient number, since it is larger than the sum of its proper divisors (450462206865).

1291242920559 is a wasteful number, since it uses less digits than its factorization.

1291242920559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11647.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 1291242920559 in words is "one trillion, two hundred ninety-one billion, two hundred forty-two million, nine hundred twenty thousand, five hundred fifty-nine".