991117733 has 4 divisors (see below), whose sum is σ = 991182048. Its totient is φ = 991053420.

The previous prime is 991117703. The next prime is 991117769. The reversal of 991117733 is 337711199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 991117733 - 2⁶ = 991117669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991117703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6248 + ... + 44958.

It is an arithmetic number, because the mean of its divisors is an integer number (247795512).

Almost surely, 2^991117733 is an apocalyptic number.

It is an amenable number.

991117733 is a deficient number, since it is larger than the sum of its proper divisors (64315).

991117733 is a wasteful number, since it uses less digits than its factorization.

991117733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64314.

The product of its digits is 35721, while the sum is 41.

The square root of 991117733 is about 31482.0223778588. The cubic root of 991117733 is about 997.0304347444.

The spelling of 991117733 in words is "nine hundred ninety-one million, one hundred seventeen thousand, seven hundred thirty-three".