15132521 has 2 divisors, whose sum is σ = 15132522. Its totient is φ = 15132520.

The previous prime is 15132473. The next prime is 15132541. The reversal of 15132521 is 12523151.

It is a happy number.

It is an a-pointer prime, because the next prime (15132541) can be obtained adding 15132521 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 1590121 = 3680^2 + 1261^2 .

It is an emirp because it is prime and its reverse (12523151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15132521 - 2⁶ = 15132457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15132493 and 15132502.

It is not a weakly prime, because it can be changed into another prime (15132541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7566260 + 7566261.

It is an arithmetic number, because the mean of its divisors is an integer number (7566261).

Almost surely, 2^15132521 is an apocalyptic number.

It is an amenable number.

15132521 is a deficient number, since it is larger than the sum of its proper divisors (1).

15132521 is an equidigital number, since it uses as much as digits as its factorization.

15132521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 20.

The square root of 15132521 is about 3890.0541127342. The cubic root of 15132521 is about 247.3453565806.

Adding to 15132521 its reverse (12523151), we get a palindrome (27655672).

The spelling of 15132521 in words is "fifteen million, one hundred thirty-two thousand, five hundred twenty-one".