991000269204 has 96 divisors (see below), whose sum is σ = 2610691655040. Its totient is φ = 289818816000.

The previous prime is 991000269191. The next prime is 991000269209. The reversal of 991000269204 is 402962000199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991000269209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8721154 + ... + 8834054.

It is an arithmetic number, because the mean of its divisors is an integer number (27194704740).

Almost surely, 2^991000269204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991000269204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305345827520).

991000269204 is an abundant number, since it is smaller than the sum of its proper divisors (1619691385836).

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

991000269204 is a wasteful number, since it uses less digits than its factorization.

991000269204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115241 (or 115239 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 991000269204 in words is "nine hundred ninety-one billion, two hundred sixty-nine thousand, two hundred four".