991252505411 has 4 divisors (see below), whose sum is σ = 1132860006192. Its totient is φ = 849645004632.

The previous prime is 991252505393. The next prime is 991252505417. The reversal of 991252505411 is 114505252199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991252505411 - 2²² = 991248311107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991252505417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70803750380 + ... + 70803750393.

It is an arithmetic number, because the mean of its divisors is an integer number (283215001548).

Almost surely, 2^991252505411 is an apocalyptic number.

991252505411 is a deficient number, since it is larger than the sum of its proper divisors (141607500781).

991252505411 is a wasteful number, since it uses less digits than its factorization.

991252505411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141607500780.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 991252505411 in words is "nine hundred ninety-one billion, two hundred fifty-two million, five hundred five thousand, four hundred eleven".