23117551 has 2 divisors, whose sum is σ = 23117552. Its totient is φ = 23117550.

The previous prime is 23117543. The next prime is 23117573. The reversal of 23117551 is 15571132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23117551 - 2³ = 23117543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23117581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11558775 + 11558776.

It is an arithmetic number, because the mean of its divisors is an integer number (11558776).

Almost surely, 2^23117551 is an apocalyptic number.

23117551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23117551 is an equidigital number, since it uses as much as digits as its factorization.

23117551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 25.

The square root of 23117551 is about 4808.0714428968. The cubic root of 23117551 is about 284.8703668169.

Adding to 23117551 its reverse (15571132), we get a palindrome (38688683).

The spelling of 23117551 in words is "twenty-three million, one hundred seventeen thousand, five hundred fifty-one".