991492873853 has 8 divisors (see below), whose sum is σ = 1004307734400. Its totient is φ = 978684621408.

The previous prime is 991492873823. The next prime is 991492873907. The reversal of 991492873853 is 358378294199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991492873853 - 2²² = 991488679549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991492873823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1349648 + ... + 1950521.

It is an arithmetic number, because the mean of its divisors is an integer number (125538466800).

Almost surely, 2^991492873853 is an apocalyptic number.

It is an amenable number.

991492873853 is a deficient number, since it is larger than the sum of its proper divisors (12814860547).

991492873853 is a wasteful number, since it uses less digits than its factorization.

991492873853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304051.

The product of its digits is 117573120, while the sum is 68.

The spelling of 991492873853 in words is "nine hundred ninety-one billion, four hundred ninety-two million, eight hundred seventy-three thousand, eight hundred fifty-three".