15855841 has 2 divisors, whose sum is σ = 15855842. Its totient is φ = 15855840.

The previous prime is 15855839. The next prime is 15855877. The reversal of 15855841 is 14855851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 2313441 = 3680^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 15855841 - 2¹ = 15855839 is a prime.

Together with 15855839, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15855841.

It is not a weakly prime, because it can be changed into another prime (15855811) 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, 7927920 + 7927921.

It is an arithmetic number, because the mean of its divisors is an integer number (7927921).

Almost surely, 2^15855841 is an apocalyptic number.

It is an amenable number.

15855841 is a deficient number, since it is larger than the sum of its proper divisors (1).

15855841 is an equidigital number, since it uses as much as digits as its factorization.

15855841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32000, while the sum is 37.

The square root of 15855841 is about 3981.9393516225. The cubic root of 15855841 is about 251.2251383368.

The spelling of 15855841 in words is "fifteen million, eight hundred fifty-five thousand, eight hundred forty-one".