2231440442545 has 4 divisors (see below), whose sum is σ = 2677728531060. Its totient is φ = 1785152354032.

The previous prime is 2231440442507. The next prime is 2231440442549. The reversal of 2231440442545 is 5452440441322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1116608549809 + 1114831892736 = 1056697^2 + 1055856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2231440442545 is a prime.

It is a super-3 number, since 3×2231440442545³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2231440442498 and 2231440442507.

It is not an unprimeable number, because it can be changed into a prime (2231440442549) 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 3 ways as a sum of consecutive naturals, for example, 223144044250 + ... + 223144044259.

It is an arithmetic number, because the mean of its divisors is an integer number (669432132765).

Almost surely, 2^{2231440442545} is an apocalyptic number.

It is an amenable number.

2231440442545 is a deficient number, since it is larger than the sum of its proper divisors (446288088515).

2231440442545 is an equidigital number, since it uses as much as digits as its factorization.

2231440442545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446288088514.

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 2231440442545 its reverse (5452440441322), we get a palindrome (7683880883867).

The spelling of 2231440442545 in words is "two trillion, two hundred thirty-one billion, four hundred forty million, four hundred forty-two thousand, five hundred forty-five".