1291492050000 has 240 divisors, whose sum is σ = 4211514445824. Its totient is φ = 340984000000.

The previous prime is 1291492049989. The next prime is 1291492050031. The reversal of 1291492050000 is 502941921.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15107377 + ... + 15192623.

Almost surely, 2^{1291492050000} is an apocalyptic number.

1291492050000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291492050000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2105757222912).

1291492050000 is an abundant number, since it is smaller than the sum of its proper divisors (2920022395824).

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

1291492050000 is an equidigital number, since it uses as much as digits as its factorization.

1291492050000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85384 (or 85358 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

Adding to 1291492050000 its reverse (502941921), we get a palindrome (1291994991921).

The spelling of 1291492050000 in words is "one trillion, two hundred ninety-one billion, four hundred ninety-two million, fifty thousand".