23171257 has 4 divisors (see below), whose sum is σ = 23181300. Its totient is φ = 23161216.

The previous prime is 23171237. The next prime is 23171299. The reversal of 23171257 is 75217132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16353936 + 6817321 = 4044^2 + 2611^2 .

It is a cyclic number.

It is not a de Polignac number, because 23171257 - 2¹⁹ = 22646969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23171227) 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, 369 + ... + 6817.

It is an arithmetic number, because the mean of its divisors is an integer number (5795325).

Almost surely, 2^23171257 is an apocalyptic number.

It is an amenable number.

23171257 is a deficient number, since it is larger than the sum of its proper divisors (10043).

23171257 is an equidigital number, since it uses as much as digits as its factorization.

23171257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10042.

The product of its digits is 2940, while the sum is 28.

The square root of 23171257 is about 4813.6531865102. The cubic root of 23171257 is about 285.0907969654.

Adding to 23171257 its reverse (75217132), we get a palindrome (98388389).

It can be divided in two parts, 2317125 and 7, that added together give a palindrome (2317132).

The spelling of 23171257 in words is "twenty-three million, one hundred seventy-one thousand, two hundred fifty-seven".