172118563 has 2 divisors, whose sum is σ = 172118564. Its totient is φ = 172118562.

The previous prime is 172118543. The next prime is 172118579. The reversal of 172118563 is 365811271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172118563 is a prime.

It is not a weakly prime, because it can be changed into another prime (172118503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86059281 + 86059282.

It is an arithmetic number, because the mean of its divisors is an integer number (86059282).

Almost surely, 2^172118563 is an apocalyptic number.

172118563 is a deficient number, since it is larger than the sum of its proper divisors (1).

172118563 is an equidigital number, since it uses as much as digits as its factorization.

172118563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 172118563 is about 13119.3964419100. The cubic root of 172118563 is about 556.2575310515.

The spelling of 172118563 in words is "one hundred seventy-two million, one hundred eighteen thousand, five hundred sixty-three".