1291090509508 has 48 divisors (see below), whose sum is σ = 2305762744320. Its totient is φ = 632466648576.

The previous prime is 1291090509497. The next prime is 1291090509509. The reversal of 1291090509508 is 8059050901921.

It is not an unprimeable number, because it can be changed into a prime (1291090509509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17193388 + ... + 17268316.

It is an arithmetic number, because the mean of its divisors is an integer number (48036723840).

Almost surely, 2^{1291090509508} is an apocalyptic number.

It is an amenable number.

1291090509508 is a deficient number, since it is larger than the sum of its proper divisors (1014672234812).

1291090509508 is a wasteful number, since it uses less digits than its factorization.

1291090509508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75484 (or 75482 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 49.

The spelling of 1291090509508 in words is "one trillion, two hundred ninety-one billion, ninety million, five hundred nine thousand, five hundred eight".