13438123997 has 2 divisors, whose sum is σ = 13438123998. Its totient is φ = 13438123996.

The previous prime is 13438123987. The next prime is 13438124027. The reversal of 13438123997 is 79932183431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12935422756 + 502701241 = 113734^2 + 22421^2 .

It is a cyclic number.

It is not a de Polignac number, because 13438123997 - 2²² = 13433929693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13438123987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6719061998 + 6719061999.

It is an arithmetic number, because the mean of its divisors is an integer number (6719061999).

Almost surely, 2^13438123997 is an apocalyptic number.

It is an amenable number.

13438123997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13438123997 is an equidigital number, since it uses as much as digits as its factorization.

13438123997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The spelling of 13438123997 in words is "thirteen billion, four hundred thirty-eight million, one hundred twenty-three thousand, nine hundred ninety-seven".