1291937708500 has 48 divisors (see below), whose sum is σ = 2970096816960. Its totient is φ = 489576391200.

The previous prime is 1291937708483. The next prime is 1291937708507. The reversal of 1291937708500 is 58077391921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291937708507) 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, 67987222 + ... + 68006221.

It is an arithmetic number, because the mean of its divisors is an integer number (61877017020).

Almost surely, 2^{1291937708500} is an apocalyptic number.

1291937708500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291937708500 is an abundant number, since it is smaller than the sum of its proper divisors (1678159108460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291937708500 is a wasteful number, since it uses less digits than its factorization.

1291937708500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135993481 (or 135993469 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 1291937708500 in words is "one trillion, two hundred ninety-one billion, nine hundred thirty-seven million, seven hundred eight thousand, five hundred".