2194581988 has 6 divisors (see below), whose sum is σ = 3840518486. Its totient is φ = 1097290992.

The previous prime is 2194581979. The next prime is 2194582021. The reversal of 2194581988 is 8891854912.

It can be written as a sum of positive squares in only one way, i.e., 1953463204 + 241118784 = 44198^2 + 15528^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274322745 + ... + 274322752.

Almost surely, 2^2194581988 is an apocalyptic number.

It is an amenable number.

2194581988 is a deficient number, since it is larger than the sum of its proper divisors (1645936498).

2194581988 is a wasteful number, since it uses less digits than its factorization.

2194581988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548645501 (or 548645499 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 55.

The square root of 2194581988 is about 46846.3657928766. The cubic root of 2194581988 is about 1299.5228994816.

The spelling of 2194581988 in words is "two billion, one hundred ninety-four million, five hundred eighty-one thousand, nine hundred eighty-eight".