15272221 has 2 divisors, whose sum is σ = 15272222. Its totient is φ = 15272220.

The previous prime is 15272197. The next prime is 15272233. The reversal of 15272221 is 12227251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 6943225 = 2886^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 15272221 - 2⁵ = 15272189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 15272192 and 15272201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15272251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7636110 + 7636111.

It is an arithmetic number, because the mean of its divisors is an integer number (7636111).

Almost surely, 2^15272221 is an apocalyptic number.

It is an amenable number.

15272221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15272221 is an equidigital number, since it uses as much as digits as its factorization.

15272221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560, while the sum is 22.

The square root of 15272221 is about 3907.9689098047. The cubic root of 15272221 is about 248.1041716808.

Adding to 15272221 its reverse (12227251), we get a palindrome (27499472).

The spelling of 15272221 in words is "fifteen million, two hundred seventy-two thousand, two hundred twenty-one".