23515147 has 2 divisors, whose sum is σ = 23515148. Its totient is φ = 23515146.

The previous prime is 23515117. The next prime is 23515171. The reversal of 23515147 is 74151532.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23515147 - 2¹⁹ = 22990859 is a prime.

It is not a weakly prime, because it can be changed into another prime (23515117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11757573 + 11757574.

It is an arithmetic number, because the mean of its divisors is an integer number (11757574).

Almost surely, 2^23515147 is an apocalyptic number.

23515147 is a deficient number, since it is larger than the sum of its proper divisors (1).

23515147 is an equidigital number, since it uses as much as digits as its factorization.

23515147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 23515147 is about 4849.2418995138. The cubic root of 23515147 is about 286.4942429555.

Adding to 23515147 its reverse (74151532), we get a palindrome (97666679).

The spelling of 23515147 in words is "twenty-three million, five hundred fifteen thousand, one hundred forty-seven".