2231520818 has 6 divisors (see below), whose sum is σ = 3347381439. Its totient is φ = 1115727006.

The previous prime is 2231520803. The next prime is 2231520839. The reversal of 2231520818 is 8180251322.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1115760409 + 1115760409 = 33403^2 + 33403^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=33403.

It is a super-3 number, since 3×2231520818³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 50105 + ... + 83507.

Almost surely, 2^2231520818 is an apocalyptic number.

2231520818 is a deficient number, since it is larger than the sum of its proper divisors (1115860621).

2231520818 is an frugal number, since it uses more digits than its factorization.

2231520818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66808 (or 33405 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 2231520818 is about 47238.9756239485. The cubic root of 2231520818 is about 1306.7734861508.

Multiplying 2231520818 by its sum of digits (32), we get a square (71408666176 = 267224²).

The spelling of 2231520818 in words is "two billion, two hundred thirty-one million, five hundred twenty thousand, eight hundred eighteen".