42971558197 has 2 divisors, whose sum is σ = 42971558198. Its totient is φ = 42971558196.

The previous prime is 42971558117. The next prime is 42971558249. The reversal of 42971558197 is 79185517924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25410272836 + 17561285361 = 159406^2 + 132519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42971558197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42971558117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21485779098 + 21485779099.

It is an arithmetic number, because the mean of its divisors is an integer number (21485779099).

Almost surely, 2^42971558197 is an apocalyptic number.

It is an amenable number.

42971558197 is a deficient number, since it is larger than the sum of its proper divisors (1).

42971558197 is an equidigital number, since it uses as much as digits as its factorization.

42971558197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 58.

The spelling of 42971558197 in words is "forty-two billion, nine hundred seventy-one million, five hundred fifty-eight thousand, one hundred ninety-seven".