15551243 has 16 divisors (see below), whose sum is σ = 17750016. Its totient is φ = 13537920.

The previous prime is 15551233. The next prime is 15551267. The reversal of 15551243 is 34215551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15551243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11480 + ... + 12762.

It is an arithmetic number, because the mean of its divisors is an integer number (1109376).

Almost surely, 2^15551243 is an apocalyptic number.

15551243 is a deficient number, since it is larger than the sum of its proper divisors (2198773).

15551243 is a wasteful number, since it uses less digits than its factorization.

15551243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354.

The product of its digits is 3000, while the sum is 26.

The square root of 15551243 is about 3943.5064346340. The cubic root of 15551243 is about 249.6060087431.

Adding to 15551243 its reverse (34215551), we get a palindrome (49766794).

The spelling of 15551243 in words is "fifteen million, five hundred fifty-one thousand, two hundred forty-three".