171121341553 has 2 divisors, whose sum is σ = 171121341554. Its totient is φ = 171121341552.

The previous prime is 171121341509. The next prime is 171121341557. The reversal of 171121341553 is 355143121171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106365342769 + 64755998784 = 326137^2 + 254472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171121341553 is a prime.

It is not a weakly prime, because it can be changed into another prime (171121341557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85560670776 + 85560670777.

It is an arithmetic number, because the mean of its divisors is an integer number (85560670777).

Almost surely, 2^171121341553 is an apocalyptic number.

It is an amenable number.

171121341553 is a deficient number, since it is larger than the sum of its proper divisors (1).

171121341553 is an equidigital number, since it uses as much as digits as its factorization.

171121341553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The spelling of 171121341553 in words is "one hundred seventy-one billion, one hundred twenty-one million, three hundred forty-one thousand, five hundred fifty-three".