991291002033 has 4 divisors (see below), whose sum is σ = 1321721336048. Its totient is φ = 660860668020.

The previous prime is 991291001977. The next prime is 991291002043. The reversal of 991291002033 is 330200192199.

991291002033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 991291002033 - 2⁶ = 991291001969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991291001982 and 991291002000.

It is not an unprimeable number, because it can be changed into a prime (991291002043) 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, 165215167003 + ... + 165215167008.

It is an arithmetic number, because the mean of its divisors is an integer number (330430334012).

Almost surely, 2^991291002033 is an apocalyptic number.

It is an amenable number.

991291002033 is a deficient number, since it is larger than the sum of its proper divisors (330430334015).

991291002033 is a wasteful number, since it uses less digits than its factorization.

991291002033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330430334014.

The product of its (nonzero) digits is 26244, while the sum is 39.

The spelling of 991291002033 in words is "nine hundred ninety-one billion, two hundred ninety-one million, two thousand, thirty-three".