43155819197 has 2 divisors, whose sum is σ = 43155819198. Its totient is φ = 43155819196.

The previous prime is 43155819181. The next prime is 43155819269. The reversal of 43155819197 is 79191855134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22145606596 + 21010212601 = 148814^2 + 144949^2 .

It is a cyclic number.

It is not a de Polignac number, because 43155819197 - 2⁴ = 43155819181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43155810197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21577909598 + 21577909599.

It is an arithmetic number, because the mean of its divisors is an integer number (21577909599).

Almost surely, 2^43155819197 is an apocalyptic number.

It is an amenable number.

43155819197 is a deficient number, since it is larger than the sum of its proper divisors (1).

43155819197 is an equidigital number, since it uses as much as digits as its factorization.

43155819197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 53.

The spelling of 43155819197 in words is "forty-three billion, one hundred fifty-five million, eight hundred nineteen thousand, one hundred ninety-seven".