23081517 has 10 divisors (see below), whose sum is σ = 34479918. Its totient is φ = 15387624.

The previous prime is 23081491. The next prime is 23081519. The reversal of 23081517 is 71518032.

It can be written as a sum of positive squares in only one way, i.e., 22410756 + 670761 = 4734^2 + 819^2 .

It is not a de Polignac number, because 23081517 - 2⁷ = 23081389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23081519) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 142398 + ... + 142559.

Almost surely, 2^23081517 is an apocalyptic number.

23081517 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

23081517 is a deficient number, since it is larger than the sum of its proper divisors (11398401).

23081517 is an equidigital number, since it uses as much as digits as its factorization.

23081517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284969 (or 284960 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 23081517 is about 4804.3227410323. The cubic root of 23081517 is about 284.7222779344.

Adding to 23081517 its reverse (71518032), we get a palindrome (94599549).

The spelling of 23081517 in words is "twenty-three million, eighty-one thousand, five hundred seventeen".