191439501444 has 27 divisors (see below), whose sum is σ = 483923153623. Its totient is φ = 63812292072.

The previous prime is 191439501439. The next prime is 191439501457. The reversal of 191439501444 is 444105934191.

It is a happy number.

The square root of 191439501444 is 437538.

It is a perfect power (a square), and thus also a powerful number.

191439501444 is a `hidden beast` number, since 19 + 143 + 9 + 50 + 1 + 444 = 666.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191439501444.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2588767 + ... + 2661689.

Almost surely, 2^191439501444 is an apocalyptic number.

191439501444 is the 437538-th square number.

It is an amenable number.

191439501444 is an abundant number, since it is smaller than the sum of its proper divisors (292483652179).

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

191439501444 is an frugal number, since it uses more digits than its factorization.

191439501444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145856 (or 72928 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 191439501444 in words is "one hundred ninety-one billion, four hundred thirty-nine million, five hundred one thousand, four hundred forty-four".