2194581989 has 4 divisors (see below), whose sum is σ = 2270257260. Its totient is φ = 2118906720.

The previous prime is 2194581979. The next prime is 2194582021. The reversal of 2194581989 is 9891854912.

2194581989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1800559489 + 394022500 = 42433^2 + 19850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2194581989 is a prime.

It is a super-2 number, since 2×2194581989² = 9632380212886392242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2194581979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37837592 + ... + 37837649.

It is an arithmetic number, because the mean of its divisors is an integer number (567564315).

Almost surely, 2^2194581989 is an apocalyptic number.

2194581989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2194581989 is a deficient number, since it is larger than the sum of its proper divisors (75675271).

2194581989 is an equidigital number, since it uses as much as digits as its factorization.

2194581989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75675270.

The product of its digits is 1866240, while the sum is 56.

The square root of 2194581989 is about 46846.3658035498. The cubic root of 2194581989 is about 1299.5228996789.

The spelling of 2194581989 in words is "two billion, one hundred ninety-four million, five hundred eighty-one thousand, nine hundred eighty-nine".