2191515480 has 768 divisors, whose sum is σ = 9743846400. Its totient is φ = 425502720.

The previous prime is 2191515479. The next prime is 2191515503. The reversal of 2191515480 is 845151912.

2191515480 is a `hidden beast` number, since 21 + 9 + 151 + 5 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 30020724 + ... + 30020796.

It is an arithmetic number, because the mean of its divisors is an integer number (12687300).

Almost surely, 2^2191515480 is an apocalyptic number.

2191515480 is a gapful number since it is divisible by the number (20) 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 2191515480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4871923200).

2191515480 is an abundant number, since it is smaller than the sum of its proper divisors (7552330920).

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

2191515480 is a wasteful number, since it uses less digits than its factorization.

2191515480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 2191515480 is about 46813.6249397545. The cubic root of 2191515480 is about 1298.9173392243.

The spelling of 2191515480 in words is "two billion, one hundred ninety-one million, five hundred fifteen thousand, four hundred eighty".