1231291097892 has 24 divisors (see below), whose sum is σ = 3192236180000. Its totient is φ = 410430365928.

The previous prime is 1231291097873. The next prime is 1231291097917. The reversal of 1231291097892 is 2987901921321.

It is a super-3 number, since 3×1231291097892³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5700421642 + ... + 5700421857.

Almost surely, 2^{1231291097892} is an apocalyptic number.

1231291097892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231291097892 is an abundant number, since it is smaller than the sum of its proper divisors (1960945082108).

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

1231291097892 is a wasteful number, since it uses less digits than its factorization.

1231291097892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11400843512 (or 11400843504 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 1231291097892 in words is "one trillion, two hundred thirty-one billion, two hundred ninety-one million, ninety-seven thousand, eight hundred ninety-two".