1991562272 has 126 divisors (see below), whose sum is σ = 4781896623. Its totient is φ = 816416832.

The previous prime is 1991562253. The next prime is 1991562281. The reversal of 1991562272 is 2722651991.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 995781136 + 995781136 = 31556^2 + 31556^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31556.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 86589653 + ... + 86589675.

Almost surely, 2^1991562272 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 1991562272

1991562272 is an abundant number, since it is smaller than the sum of its proper divisors (2790334351).

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

1991562272 is an frugal number, since it uses more digits than its factorization.

1991562272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 32 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 1991562272 is about 44626.9231742454. The cubic root of 1991562272 is about 1258.1467405072.

The spelling of 1991562272 in words is "one billion, nine hundred ninety-one million, five hundred sixty-two thousand, two hundred seventy-two".