2191968450 has 108 divisors (see below), whose sum is σ = 6850641330. Its totient is φ = 501016320.

The previous prime is 2191968439. The next prime is 2191968479. The reversal of 2191968450 is 548691912.

2191968450 is a `hidden beast` number, since 2 + 1 + 9 + 196 + 8 + 450 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1769295969 + 422672481 = 42063^2 + 20559^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2191968396 and 2191968405.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 27655 + ... + 71754.

Almost surely, 2^2191968450 is an apocalyptic number.

2191968450 is an abundant number, since it is smaller than the sum of its proper divisors (4658672880).

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

2191968450 is a wasteful number, since it uses less digits than its factorization.

2191968450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99441 (or 99426 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 2191968450 is about 46818.4627043648. The cubic root of 2191968450 is about 1299.0068252534.

The spelling of 2191968450 in words is "two billion, one hundred ninety-one million, nine hundred sixty-eight thousand, four hundred fifty".