171138827449 has 2 divisors, whose sum is σ = 171138827450. Its totient is φ = 171138827448.

The previous prime is 171138827443. The next prime is 171138827507. The reversal of 171138827449 is 944728831171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120570061824 + 50568765625 = 347232^2 + 224875^2 .

It is an emirp because it is prime and its reverse (944728831171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171138827449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171138827449.

It is not a weakly prime, because it can be changed into another prime (171138827443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85569413724 + 85569413725.

It is an arithmetic number, because the mean of its divisors is an integer number (85569413725).

Almost surely, 2^171138827449 is an apocalyptic number.

It is an amenable number.

171138827449 is a deficient number, since it is larger than the sum of its proper divisors (1).

171138827449 is an equidigital number, since it uses as much as digits as its factorization.

171138827449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The spelling of 171138827449 in words is "one hundred seventy-one billion, one hundred thirty-eight million, eight hundred twenty-seven thousand, four hundred forty-nine".