15342561 has 16 divisors (see below), whose sum is σ = 24478720. Its totient is φ = 9441360.

The previous prime is 15342559. The next prime is 15342581. The reversal of 15342561 is 16524351.

It is not a de Polignac number, because 15342561 - 2¹ = 15342559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15342581) 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 15 ways as a sum of consecutive naturals, for example, 21505 + ... + 22206.

It is an arithmetic number, because the mean of its divisors is an integer number (1529920).

Almost surely, 2^15342561 is an apocalyptic number.

It is an amenable number.

15342561 is a deficient number, since it is larger than the sum of its proper divisors (9136159).

15342561 is a wasteful number, since it uses less digits than its factorization.

15342561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43733 (or 43727 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 15342561 is about 3916.9581309991. The cubic root of 15342561 is about 248.4844901504.

It can be divided in two parts, 1534 and 2561, that added together give a triangular number (4095 = T₉₀).

The spelling of 15342561 in words is "fifteen million, three hundred forty-two thousand, five hundred sixty-one".