15642541 has 2 divisors, whose sum is σ = 15642542. Its totient is φ = 15642540.

The previous prime is 15642521. The next prime is 15642547. The reversal of 15642541 is 14524651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14092516 + 1550025 = 3754^2 + 1245^2 .

It is an emirp because it is prime and its reverse (14524651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15642541 - 2⁵ = 15642509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642547) 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, 7821270 + 7821271.

It is an arithmetic number, because the mean of its divisors is an integer number (7821271).

Almost surely, 2^15642541 is an apocalyptic number.

It is an amenable number.

15642541 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642541 is an equidigital number, since it uses as much as digits as its factorization.

15642541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

The square root of 15642541 is about 3955.0652333432. The cubic root of 15642541 is about 250.0935170139.

The spelling of 15642541 in words is "fifteen million, six hundred forty-two thousand, five hundred forty-one".