2191982490 has 48 divisors (see below), whose sum is σ = 5853194568. Its totient is φ = 568729728.

The previous prime is 2191982489. The next prime is 2191982509. The reversal of 2191982490 is 942891912.

2191982490 is a `hidden beast` number, since 219 + 198 + 249 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1925542161 + 266440329 = 43881^2 + 16323^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325797 + ... + 332456.

Almost surely, 2^2191982490 is an apocalyptic number.

2191982490 is an abundant number, since it is smaller than the sum of its proper divisors (3661212078).

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

2191982490 is a wasteful number, since it uses less digits than its factorization.

2191982490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658303 (or 658300 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 2191982490 is about 46818.6126449727. The cubic root of 2191982490 is about 1299.0095987144.

The spelling of 2191982490 in words is "two billion, one hundred ninety-one million, nine hundred eighty-two thousand, four hundred ninety".