171492387749 has 2 divisors, whose sum is σ = 171492387750. Its totient is φ = 171492387748.

The previous prime is 171492387713. The next prime is 171492387839. The reversal of 171492387749 is 947783294171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98773175524 + 72719212225 = 314282^2 + 269665^2 .

It is a cyclic number.

It is not a de Polignac number, because 171492387749 - 2³⁶ = 102772911013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171492387691 and 171492387700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171492287749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85746193874 + 85746193875.

It is an arithmetic number, because the mean of its divisors is an integer number (85746193875).

Almost surely, 2^171492387749 is an apocalyptic number.

It is an amenable number.

171492387749 is a deficient number, since it is larger than the sum of its proper divisors (1).

171492387749 is an equidigital number, since it uses as much as digits as its factorization.

171492387749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 62.

The spelling of 171492387749 in words is "one hundred seventy-one billion, four hundred ninety-two million, three hundred eighty-seven thousand, seven hundred forty-nine".