1813229617 has 4 divisors (see below), whose sum is σ = 1813360500. Its totient is φ = 1813098736.

The previous prime is 1813229549. The next prime is 1813229629. The reversal of 1813229617 is 7169223181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7169223181 = 28513 ⋅251437.

It can be written as a sum of positive squares in 2 ways, for example, as 475937856 + 1337291761 = 21816^2 + 36569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813229617 - 2²³ = 1804841009 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1813229617.

It is not an unprimeable number, because it can be changed into a prime (1813229647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41818 + ... + 73315.

It is an arithmetic number, because the mean of its divisors is an integer number (453340125).

Almost surely, 2^1813229617 is an apocalyptic number.

It is an amenable number.

1813229617 is a deficient number, since it is larger than the sum of its proper divisors (130883).

1813229617 is a wasteful number, since it uses less digits than its factorization.

1813229617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130882.

The product of its digits is 36288, while the sum is 40.

The square root of 1813229617 is about 42582.0339697389. The cubic root of 1813229617 is about 1219.4133202219.

The spelling of 1813229617 in words is "one billion, eight hundred thirteen million, two hundred twenty-nine thousand, six hundred seventeen".