23771394397 has 2 divisors, whose sum is σ = 23771394398. Its totient is φ = 23771394396.

The previous prime is 23771394343. The next prime is 23771394419. The reversal of 23771394397 is 79349317732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13147144921 + 10624249476 = 114661^2 + 103074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23771394397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23771394307) 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, 11885697198 + 11885697199.

It is an arithmetic number, because the mean of its divisors is an integer number (11885697199).

Almost surely, 2^23771394397 is an apocalyptic number.

It is an amenable number.

23771394397 is a deficient number, since it is larger than the sum of its proper divisors (1).

23771394397 is an equidigital number, since it uses as much as digits as its factorization.

23771394397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6001128, while the sum is 55.

The spelling of 23771394397 in words is "twenty-three billion, seven hundred seventy-one million, three hundred ninety-four thousand, three hundred ninety-seven".