1181891248 has 40 divisors (see below), whose sum is σ = 2401632000. Its totient is φ = 562377024.

The previous prime is 1181891239. The next prime is 1181891299. The reversal of 1181891248 is 8421981811.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65163 + ... + 81301.

It is an arithmetic number, because the mean of its divisors is an integer number (60040800).

Almost surely, 2^1181891248 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 1181891248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200816000).

1181891248 is an abundant number, since it is smaller than the sum of its proper divisors (1219740752).

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

1181891248 is a wasteful number, since it uses less digits than its factorization.

1181891248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16369 (or 16363 counting only the distinct ones).

The product of its digits is 36864, while the sum is 43.

The square root of 1181891248 is about 34378.6452321787. The cubic root of 1181891248 is about 1057.2860584333.

The spelling of 1181891248 in words is "one billion, one hundred eighty-one million, eight hundred ninety-one thousand, two hundred forty-eight".