23120857 has 2 divisors, whose sum is σ = 23120858. Its totient is φ = 23120856.

The previous prime is 23120849. The next prime is 23120873. The reversal of 23120857 is 75802132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19044496 + 4076361 = 4364^2 + 2019^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120857 - 2³ = 23120849 is a prime.

It is not a weakly prime, because it can be changed into another prime (23120807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560428 + 11560429.

It is an arithmetic number, because the mean of its divisors is an integer number (11560429).

Almost surely, 2^23120857 is an apocalyptic number.

It is an amenable number.

23120857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23120857 is an equidigital number, since it uses as much as digits as its factorization.

23120857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 23120857 is about 4808.4152274944. The cubic root of 23120857 is about 284.8839457717.

Adding to 23120857 its reverse (75802132), we get a palindrome (98922989).

The spelling of 23120857 in words is "twenty-three million, one hundred twenty thousand, eight hundred fifty-seven".