1818022731 has 16 divisors (see below), whose sum is σ = 2865849600. Its totient is φ = 1003046688.

The previous prime is 1818022691. The next prime is 1818022753. The reversal of 1818022731 is 1372208181.

It is not a de Polignac number, because 1818022731 - 2⁶ = 1818022667 is a prime.

It is a super-3 number, since 3×1818022731³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1818022692 and 1818022701.

It is not an unprimeable number, because it can be changed into a prime (1818022331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492021 + ... + 1493238.

It is an arithmetic number, because the mean of its divisors is an integer number (179115600).

Almost surely, 2^1818022731 is an apocalyptic number.

1818022731 is a deficient number, since it is larger than the sum of its proper divisors (1047826869).

1818022731 is a wasteful number, since it uses less digits than its factorization.

1818022731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985298.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1818022731 is about 42638.2777677523. The cubic root of 1818022731 is about 1220.4868456947.

The spelling of 1818022731 in words is "one billion, eight hundred eighteen million, twenty-two thousand, seven hundred thirty-one".