15220131 has 4 divisors (see below), whose sum is σ = 20293512. Its totient is φ = 10146752.

The previous prime is 15220129. The next prime is 15220133. The reversal of 15220131 is 13102251.

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

It is an interprime number because it is at equal distance from previous prime (15220129) and next prime (15220133).

It is a cyclic number.

It is not a de Polignac number, because 15220131 - 2¹ = 15220129 is a prime.

It is a super-2 number, since 2×15220131² = 463304775314322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15220131.

It is not an unprimeable number, because it can be changed into a prime (15220133) 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 3 ways as a sum of consecutive naturals, for example, 2536686 + ... + 2536691.

It is an arithmetic number, because the mean of its divisors is an integer number (5073378).

Almost surely, 2^15220131 is an apocalyptic number.

15220131 is a deficient number, since it is larger than the sum of its proper divisors (5073381).

15220131 is an equidigital number, since it uses as much as digits as its factorization.

15220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073380.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 15220131 is about 3901.2986299436. The cubic root of 15220131 is about 247.8217751321.

Adding to 15220131 its reverse (13102251), we get a palindrome (28322382).

It can be divided in two parts, 15220 and 131, that added together give a palindrome (15351).

The spelling of 15220131 in words is "fifteen million, two hundred twenty thousand, one hundred thirty-one".