23505157 has 4 divisors (see below), whose sum is σ = 25313260. Its totient is φ = 21697056.

The previous prime is 23505143. The next prime is 23505173. The reversal of 23505157 is 75150532.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7392961 + 16112196 = 2719^2 + 4014^2 .

It is a cyclic number.

It is not a de Polignac number, because 23505157 - 2¹⁵ = 23472389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23505127) 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 in 3 ways as a sum of consecutive naturals, for example, 904032 + ... + 904057.

It is an arithmetic number, because the mean of its divisors is an integer number (6328315).

Almost surely, 2^23505157 is an apocalyptic number.

It is an amenable number.

23505157 is a deficient number, since it is larger than the sum of its proper divisors (1808103).

23505157 is a wasteful number, since it uses less digits than its factorization.

23505157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808102.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 23505157 is about 4848.2117321751. The cubic root of 23505157 is about 286.4536665151.

Adding to 23505157 its reverse (75150532), we get a palindrome (98655689).

The spelling of 23505157 in words is "twenty-three million, five hundred five thousand, one hundred fifty-seven".