15442561 has 4 divisors (see below), whose sum is σ = 15586992. Its totient is φ = 15298132.

The previous prime is 15442549. The next prime is 15442589. The reversal of 15442561 is 16524451.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16524451 = 163 ⋅101377.

It is a cyclic number.

It is not a de Polignac number, because 15442561 - 2¹³ = 15434369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15440561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72055 + ... + 72268.

It is an arithmetic number, because the mean of its divisors is an integer number (3896748).

Almost surely, 2^15442561 is an apocalyptic number.

It is an amenable number.

15442561 is a deficient number, since it is larger than the sum of its proper divisors (144431).

15442561 is a wasteful number, since it uses less digits than its factorization.

15442561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144430.

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

The square root of 15442561 is about 3929.7024060353. The cubic root of 15442561 is about 249.0231802638.

The spelling of 15442561 in words is "fifteen million, four hundred forty-two thousand, five hundred sixty-one".