1491091806552 has 16 divisors (see below), whose sum is σ = 3727729516440. Its totient is φ = 497030602176.

The previous prime is 1491091806541. The next prime is 1491091806577. The reversal of 1491091806552 is 2556081901941.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1491091806495 and 1491091806504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31064412613 + ... + 31064412660.

Almost surely, 2^{1491091806552} is an apocalyptic number.

1491091806552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1491091806552 is an abundant number, since it is smaller than the sum of its proper divisors (2236637709888).

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

1491091806552 is a wasteful number, since it uses less digits than its factorization.

1491091806552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62128825282 (or 62128825278 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 51.

The spelling of 1491091806552 in words is "one trillion, four hundred ninety-one billion, ninety-one million, eight hundred six thousand, five hundred fifty-two".