15220313 has 2 divisors, whose sum is σ = 15220314. Its totient is φ = 15220312.

The previous prime is 15220267. The next prime is 15220327. The reversal of 15220313 is 31302251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10843849 + 4376464 = 3293^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220313 - 2¹² = 15216217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15220291 and 15220300.

It is not a weakly prime, because it can be changed into another prime (15220333) 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 as a sum of consecutive naturals, namely, 7610156 + 7610157.

It is an arithmetic number, because the mean of its divisors is an integer number (7610157).

Almost surely, 2^15220313 is an apocalyptic number.

It is an amenable number.

15220313 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220313 is an equidigital number, since it uses as much as digits as its factorization.

15220313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 15220313 is about 3901.3219554402. The cubic root of 15220313 is about 247.8227629331.

Adding to 15220313 its reverse (31302251), we get a palindrome (46522564).

The spelling of 15220313 in words is "fifteen million, two hundred twenty thousand, three hundred thirteen".