15532312243 has 4 divisors (see below), whose sum is σ = 17751214000. Its totient is φ = 13313410488.

The previous prime is 15532312219. The next prime is 15532312249. The reversal of 15532312243 is 34221323551.

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

It is a de Polignac number, because none of the positive numbers 2^k-15532312243 is a prime.

It is a super-2 number, since 2×15532312243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15532312249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109450868 + ... + 1109450881.

It is an arithmetic number, because the mean of its divisors is an integer number (4437803500).

Almost surely, 2^15532312243 is an apocalyptic number.

15532312243 is a deficient number, since it is larger than the sum of its proper divisors (2218901757).

15532312243 is an equidigital number, since it uses as much as digits as its factorization.

15532312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218901756.

The product of its digits is 21600, while the sum is 31.

Adding to 15532312243 its reverse (34221323551), we get a palindrome (49753635794).

The spelling of 15532312243 in words is "fifteen billion, five hundred thirty-two million, three hundred twelve thousand, two hundred forty-three".