15145609 has 4 divisors (see below), whose sum is σ = 15467904. Its totient is φ = 14823316.

The previous prime is 15145607. The next prime is 15145621. The reversal of 15145609 is 90654151.

15145609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 90654151 = 7 ⋅12950593.

It is a cyclic number.

It is not a de Polignac number, because 15145609 - 2¹ = 15145607 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15145607) 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, 161077 + ... + 161170.

It is an arithmetic number, because the mean of its divisors is an integer number (3866976).

Almost surely, 2^15145609 is an apocalyptic number.

It is an amenable number.

15145609 is a deficient number, since it is larger than the sum of its proper divisors (322295).

15145609 is an equidigital number, since it uses as much as digits as its factorization.

15145609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322294.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 15145609 is about 3891.7359879622. The cubic root of 15145609 is about 247.4166450588.

The spelling of 15145609 in words is "fifteen million, one hundred forty-five thousand, six hundred nine".