23138504887 has 2 divisors, whose sum is σ = 23138504888. Its totient is φ = 23138504886.

The previous prime is 23138504843. The next prime is 23138504903. The reversal of 23138504887 is 78840583132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23138504887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23138504887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23138504087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569252443 + 11569252444.

It is an arithmetic number, because the mean of its divisors is an integer number (11569252444).

Almost surely, 2^23138504887 is an apocalyptic number.

23138504887 is a deficient number, since it is larger than the sum of its proper divisors (1).

23138504887 is an equidigital number, since it uses as much as digits as its factorization.

23138504887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 23138504887 in words is "twenty-three billion, one hundred thirty-eight million, five hundred four thousand, eight hundred eighty-seven".