43887169397 has 2 divisors, whose sum is σ = 43887169398. Its totient is φ = 43887169396.

The previous prime is 43887169279. The next prime is 43887169429. The reversal of 43887169397 is 79396178834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39951614641 + 3935554756 = 199879^2 + 62734^2 .

It is a cyclic number.

It is not a de Polignac number, because 43887169397 - 2⁸ = 43887169141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43887169897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21943584698 + 21943584699.

It is an arithmetic number, because the mean of its divisors is an integer number (21943584699).

Almost surely, 2^43887169397 is an apocalyptic number.

It is an amenable number.

43887169397 is a deficient number, since it is larger than the sum of its proper divisors (1).

43887169397 is an equidigital number, since it uses as much as digits as its factorization.

43887169397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 65.

The spelling of 43887169397 in words is "forty-three billion, eight hundred eighty-seven million, one hundred sixty-nine thousand, three hundred ninety-seven".