1813242281 has 4 divisors (see below), whose sum is σ = 1851821952. Its totient is φ = 1774662612.

The previous prime is 1813242269. The next prime is 1813242289. The reversal of 1813242281 is 1822423181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1822423181 = 12721 ⋅143261.

It is a cyclic number.

It is not a de Polignac number, because 1813242281 - 2⁶ = 1813242217 is a prime.

It is a super-2 number, since 2×1813242281² = 6575695139212165922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813242289) 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, 19289765 + ... + 19289858.

It is an arithmetic number, because the mean of its divisors is an integer number (462955488).

Almost surely, 2^1813242281 is an apocalyptic number.

It is an amenable number.

1813242281 is a deficient number, since it is larger than the sum of its proper divisors (38579671).

1813242281 is an equidigital number, since it uses as much as digits as its factorization.

1813242281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38579670.

The product of its digits is 6144, while the sum is 32.

The square root of 1813242281 is about 42582.1826706899. The cubic root of 1813242281 is about 1219.4161591002.

Subtracting 1813242281 from its reverse (1822423181), we obtain a square (9180900 = 3030²).

The spelling of 1813242281 in words is "one billion, eight hundred thirteen million, two hundred forty-two thousand, two hundred eighty-one".