991559719254 has 32 divisors (see below), whose sum is σ = 2135705058144. Its totient is φ = 305089873920.

The previous prime is 991559719237. The next prime is 991559719261. The reversal of 991559719254 is 452917955199.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8158774 + ... + 8279414.

It is an arithmetic number, because the mean of its divisors is an integer number (66740783067).

Almost surely, 2^991559719254 is an apocalyptic number.

991559719254 is an abundant number, since it is smaller than the sum of its proper divisors (1144145338890).

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

991559719254 is a wasteful number, since it uses less digits than its factorization.

991559719254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226032.

The product of its digits is 45927000, while the sum is 66.

The spelling of 991559719254 in words is "nine hundred ninety-one billion, five hundred fifty-nine million, seven hundred nineteen thousand, two hundred fifty-four".