1813318765 has 8 divisors (see below), whose sum is σ = 2189333088. Its totient is φ = 1441754640.

The previous prime is 1813318747. The next prime is 1813318769. The reversal of 1813318765 is 5678133181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1813318765 - 2⁹ = 1813318253 is a prime.

It is a super-2 number, since 2×1813318765² = 6576249887002250450, 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 (1813318769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111651 + ... + 1113280.

It is an arithmetic number, because the mean of its divisors is an integer number (273666636).

Almost surely, 2^1813318765 is an apocalyptic number.

It is an amenable number.

1813318765 is a deficient number, since it is larger than the sum of its proper divisors (376014323).

1813318765 is a wasteful number, since it uses less digits than its factorization.

1813318765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225099.

The product of its digits is 120960, while the sum is 43.

The square root of 1813318765 is about 42583.0807363676. The cubic root of 1813318765 is about 1219.4333041732.

It can be divided in two parts, 181331 and 8765, that added together give a square (190096 = 436²).

The spelling of 1813318765 in words is "one billion, eight hundred thirteen million, three hundred eighteen thousand, seven hundred sixty-five".