23531155391 has 2 divisors, whose sum is σ = 23531155392. Its totient is φ = 23531155390.

The previous prime is 23531155367. The next prime is 23531155469. The reversal of 23531155391 is 19355113532.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23531155391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23531152391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765577695 + 11765577696.

It is an arithmetic number, because the mean of its divisors is an integer number (11765577696).

Almost surely, 2^23531155391 is an apocalyptic number.

23531155391 is a deficient number, since it is larger than the sum of its proper divisors (1).

23531155391 is an equidigital number, since it uses as much as digits as its factorization.

23531155391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 38.

The spelling of 23531155391 in words is "twenty-three billion, five hundred thirty-one million, one hundred fifty-five thousand, three hundred ninety-one".