15981541 has 2 divisors, whose sum is σ = 15981542. Its totient is φ = 15981540.

The previous prime is 15981419. The next prime is 15981557. The reversal of 15981541 is 14518951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 5157441 = 3290^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 15981541 - 2¹⁵ = 15948773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15981497 and 15981506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15981341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7990770 + 7990771.

It is an arithmetic number, because the mean of its divisors is an integer number (7990771).

Almost surely, 2^15981541 is an apocalyptic number.

It is an amenable number.

15981541 is a deficient number, since it is larger than the sum of its proper divisors (1).

15981541 is an equidigital number, since it uses as much as digits as its factorization.

15981541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 34.

The square root of 15981541 is about 3997.6919591184. The cubic root of 15981541 is about 251.8872690118.

The spelling of 15981541 in words is "fifteen million, nine hundred eighty-one thousand, five hundred forty-one".