23091205517 has 2 divisors, whose sum is σ = 23091205518. Its totient is φ = 23091205516.

The previous prime is 23091205499. The next prime is 23091205531. The reversal of 23091205517 is 71550219032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17671448356 + 5419757161 = 132934^2 + 73619^2 .

It is a cyclic number.

It is not a de Polignac number, because 23091205517 - 2⁸ = 23091205261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23091205547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11545602758 + 11545602759.

It is an arithmetic number, because the mean of its divisors is an integer number (11545602759).

Almost surely, 2^23091205517 is an apocalyptic number.

It is an amenable number.

23091205517 is a deficient number, since it is larger than the sum of its proper divisors (1).

23091205517 is an equidigital number, since it uses as much as digits as its factorization.

23091205517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 23091205517 in words is "twenty-three billion, ninety-one million, two hundred five thousand, five hundred seventeen".