2194087281 has 4 divisors (see below), whose sum is σ = 2925449712. Its totient is φ = 1462724852.

The previous prime is 2194087271. The next prime is 2194087289. The reversal of 2194087281 is 1827804912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2194087281 - 2¹⁷ = 2193956209 is a prime.

It is a super-2 number, since 2×2194087281² = 9628037993291945922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2194087289) 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, 365681211 + ... + 365681216.

It is an arithmetic number, because the mean of its divisors is an integer number (731362428).

Almost surely, 2^2194087281 is an apocalyptic number.

It is an amenable number.

2194087281 is a deficient number, since it is larger than the sum of its proper divisors (731362431).

2194087281 is an equidigital number, since it uses as much as digits as its factorization.

2194087281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731362430.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 2194087281 is about 46841.0853951955. The cubic root of 2194087281 is about 1299.4252451384.

The spelling of 2194087281 in words is "two billion, one hundred ninety-four million, eighty-seven thousand, two hundred eighty-one".