15395561 has 4 divisors (see below), whose sum is σ = 15892224. Its totient is φ = 14898900.

The previous prime is 15395543. The next prime is 15395573. The reversal of 15395561 is 16559351.

It is a happy number.

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: 16559351 = 241 ⋅68711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15395561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15395521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248285 + ... + 248346.

It is an arithmetic number, because the mean of its divisors is an integer number (3973056).

Almost surely, 2^15395561 is an apocalyptic number.

It is an amenable number.

15395561 is a deficient number, since it is larger than the sum of its proper divisors (496663).

15395561 is an equidigital number, since it uses as much as digits as its factorization.

15395561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496662.

The product of its digits is 20250, while the sum is 35.

The square root of 15395561 is about 3923.7177523364. The cubic root of 15395561 is about 248.7702864696.

The spelling of 15395561 in words is "fifteen million, three hundred ninety-five thousand, five hundred sixty-one".