15841561 has 4 divisors (see below), whose sum is σ = 15946624. Its totient is φ = 15736500.

The previous prime is 15841543. The next prime is 15841571. The reversal of 15841561 is 16514851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15841561 - 2¹¹ = 15839513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15841571) 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 in 3 ways as a sum of consecutive naturals, for example, 52305 + ... + 52606.

It is an arithmetic number, because the mean of its divisors is an integer number (3986656).

Almost surely, 2^15841561 is an apocalyptic number.

It is an amenable number.

15841561 is a deficient number, since it is larger than the sum of its proper divisors (105063).

15841561 is a wasteful number, since it uses less digits than its factorization.

15841561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105062.

The product of its digits is 4800, while the sum is 31.

The square root of 15841561 is about 3980.1458515989. The cubic root of 15841561 is about 251.1496966852.

The spelling of 15841561 in words is "fifteen million, eight hundred forty-one thousand, five hundred sixty-one".