15423509 has 2 divisors, whose sum is σ = 15423510. Its totient is φ = 15423508.

The previous prime is 15423493. The next prime is 15423511. The reversal of 15423509 is 90532451.

15423509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14799409 + 624100 = 3847^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 15423509 - 2⁴ = 15423493 is a prime.

Together with 15423511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15423589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7711754 + 7711755.

It is an arithmetic number, because the mean of its divisors is an integer number (7711755).

Almost surely, 2^15423509 is an apocalyptic number.

It is an amenable number.

15423509 is a deficient number, since it is larger than the sum of its proper divisors (1).

15423509 is an equidigital number, since it uses as much as digits as its factorization.

15423509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 15423509 is about 3927.2775557630. The cubic root of 15423509 is about 248.9207287323.

The spelling of 15423509 in words is "fifteen million, four hundred twenty-three thousand, five hundred nine".