15220231 has 4 divisors (see below), whose sum is σ = 16391032. Its totient is φ = 14049432.

The previous prime is 15220193. The next prime is 15220241. The reversal of 15220231 is 13202251.

15220231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 15220231 - 2¹⁹ = 14695943 is a prime.

It is a super-3 number, since 3×15220231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585381 + ... + 585406.

It is an arithmetic number, because the mean of its divisors is an integer number (4097758).

Almost surely, 2^15220231 is an apocalyptic number.

15220231 is a deficient number, since it is larger than the sum of its proper divisors (1170801).

15220231 is a wasteful number, since it uses less digits than its factorization.

15220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170800.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 15220231 is about 3901.3114461678. The cubic root of 15220231 is about 247.8223178809.

Adding to 15220231 its reverse (13202251), we get a palindrome (28422482).

It can be divided in two parts, 15220 and 231, that added together give a palindrome (15451).

The spelling of 15220231 in words is "fifteen million, two hundred twenty thousand, two hundred thirty-one".