15390561 has 8 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 9906512.

The previous prime is 15390547. The next prime is 15390581. The reversal of 15390561 is 16509351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15390561 - 2¹³ = 15382369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15390521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88365 + ... + 88538.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 2^15390561 is an apocalyptic number.

It is an amenable number.

15390561 is a deficient number, since it is larger than the sum of its proper divisors (5837919).

15390561 is a wasteful number, since it uses less digits than its factorization.

15390561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176935.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 15390561 is about 3923.0805497721. The cubic root of 15390561 is about 248.7433525996.

It can be divided in two parts, 15390 and 561, that added together give a palindrome (15951).

The spelling of 15390561 in words is "fifteen million, three hundred ninety thousand, five hundred sixty-one".