2191142250 has 192 divisors, whose sum is σ = 6508809216. Its totient is φ = 527472000.

The previous prime is 2191142237. The next prime is 2191142251. The reversal of 2191142250 is 522411912.

2191142250 is a `hidden beast` number, since 2 + 191 + 1 + 422 + 50 = 666.

It is a super-2 number, since 2×2191142250² = 9602208719470125000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191142251) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5519052 + ... + 5519448.

It is an arithmetic number, because the mean of its divisors is an integer number (33900048).

Almost surely, 2^2191142250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191142250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3254404608).

2191142250 is an abundant number, since it is smaller than the sum of its proper divisors (4317666966).

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

2191142250 is a wasteful number, since it uses less digits than its factorization.

2191142250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 2191142250 is about 46809.6384305626. The cubic root of 2191142250 is about 1298.8435968837.

It can be divided in two parts, 2191 and 142250, that added together give a palindrome (144441).

The spelling of 2191142250 in words is "two billion, one hundred ninety-one million, one hundred forty-two thousand, two hundred fifty".