23533535491 has 2 divisors, whose sum is σ = 23533535492. Its totient is φ = 23533535490.

The previous prime is 23533535453. The next prime is 23533535503. The reversal of 23533535491 is 19453533532.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23533535491 is a prime.

It is a super-2 number, since 2×23533535491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23533535191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11766767745 + 11766767746.

It is an arithmetic number, because the mean of its divisors is an integer number (11766767746).

Almost surely, 2^23533535491 is an apocalyptic number.

23533535491 is a deficient number, since it is larger than the sum of its proper divisors (1).

23533535491 is an equidigital number, since it uses as much as digits as its factorization.

23533535491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 43.

The spelling of 23533535491 in words is "twenty-three billion, five hundred thirty-three million, five hundred thirty-five thousand, four hundred ninety-one".