38991297213793 has 2 divisors, whose sum is σ = 38991297213794. Its totient is φ = 38991297213792.

The previous prime is 38991297213749. The next prime is 38991297213833. The reversal of 38991297213793 is 39731279219983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28720252920384 + 10271044293409 = 5359128^2 + 3204847^2 .

It is a cyclic number.

It is not a de Polignac number, because 38991297213793 - 2¹⁷ = 38991297082721 is a prime.

It is not a weakly prime, because it can be changed into another prime (38991297213733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19495648606896 + 19495648606897.

It is an arithmetic number, because the mean of its divisors is an integer number (19495648606897).

Almost surely, 2^{38991297213793} is an apocalyptic number.

It is an amenable number.

38991297213793 is a deficient number, since it is larger than the sum of its proper divisors (1).

38991297213793 is an equidigital number, since it uses as much as digits as its factorization.

38991297213793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 277766496, while the sum is 73.

The spelling of 38991297213793 in words is "thirty-eight trillion, nine hundred ninety-one billion, two hundred ninety-seven million, two hundred thirteen thousand, seven hundred ninety-three".