172136539 has 2 divisors, whose sum is σ = 172136540. Its totient is φ = 172136538.

The previous prime is 172136533. The next prime is 172136581. The reversal of 172136539 is 935631271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172136539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172136498 and 172136507.

It is not a weakly prime, because it can be changed into another prime (172136533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86068269 + 86068270.

It is an arithmetic number, because the mean of its divisors is an integer number (86068270).

Almost surely, 2^172136539 is an apocalyptic number.

172136539 is a deficient number, since it is larger than the sum of its proper divisors (1).

172136539 is an equidigital number, since it uses as much as digits as its factorization.

172136539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 172136539 is about 13120.0815165151. The cubic root of 172136539 is about 556.2768954887.

The spelling of 172136539 in words is "one hundred seventy-two million, one hundred thirty-six thousand, five hundred thirty-nine".