12737521 has 2 divisors, whose sum is σ = 12737522. Its totient is φ = 12737520.

The previous prime is 12737507. The next prime is 12737531. The reversal of 12737521 is 12573721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 5640625 = 2664^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 12737521 - 2¹³ = 12729329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12737521.

It is not a weakly prime, because it can be changed into another prime (12737531) 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, 6368760 + 6368761.

It is an arithmetic number, because the mean of its divisors is an integer number (6368761).

Almost surely, 2^12737521 is an apocalyptic number.

It is an amenable number.

12737521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12737521 is an equidigital number, since it uses as much as digits as its factorization.

12737521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 28.

The square root of 12737521 is about 3568.9663769781. The cubic root of 12737521 is about 233.5401945579.

The spelling of 12737521 in words is "twelve million, seven hundred thirty-seven thousand, five hundred twenty-one".