172135643 has 2 divisors, whose sum is σ = 172135644. Its totient is φ = 172135642.

The previous prime is 172135631. The next prime is 172135651. The reversal of 172135643 is 346531271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172135643 is a prime.

It is not a weakly prime, because it can be changed into another prime (172135603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86067821 + 86067822.

It is an arithmetic number, because the mean of its divisors is an integer number (86067822).

Almost surely, 2^172135643 is an apocalyptic number.

172135643 is a deficient number, since it is larger than the sum of its proper divisors (1).

172135643 is an equidigital number, since it uses as much as digits as its factorization.

172135643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 172135643 is about 13120.0473703413. The cubic root of 172135643 is about 556.2759303150.

The spelling of 172135643 in words is "one hundred seventy-two million, one hundred thirty-five thousand, six hundred forty-three".