1991254248 has 96 divisors (see below), whose sum is σ = 5661676800. Its totient is φ = 631411200.

The previous prime is 1991254241. The next prime is 1991254303. The reversal of 1991254248 is 8424521991.

It is a happy number.

1991254248 is a `hidden beast` number, since 1 + 99 + 12 + 542 + 4 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1991254241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124128 + ... + 139248.

It is an arithmetic number, because the mean of its divisors is an integer number (58975800).

Almost surely, 2^1991254248 is an apocalyptic number.

1991254248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1991254248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2830838400).

1991254248 is an abundant number, since it is smaller than the sum of its proper divisors (3670422552).

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

1991254248 is a wasteful number, since it uses less digits than its factorization.

1991254248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15223 (or 15216 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1991254248 is about 44623.4719402245. The cubic root of 1991254248 is about 1258.0818736138.

The spelling of 1991254248 in words is "one billion, nine hundred ninety-one million, two hundred fifty-four thousand, two hundred forty-eight".