172478563 has 2 divisors, whose sum is σ = 172478564. Its totient is φ = 172478562.

The previous prime is 172478533. The next prime is 172478591. The reversal of 172478563 is 365874271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172478563 - 2⁵ = 172478531 is a prime.

It is not a weakly prime, because it can be changed into another prime (172478533) 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, 86239281 + 86239282.

It is an arithmetic number, because the mean of its divisors is an integer number (86239282).

Almost surely, 2^172478563 is an apocalyptic number.

172478563 is a deficient number, since it is larger than the sum of its proper divisors (1).

172478563 is an equidigital number, since it uses as much as digits as its factorization.

172478563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 43.

The square root of 172478563 is about 13133.1094185650. The cubic root of 172478563 is about 556.6450802981.

The spelling of 172478563 in words is "one hundred seventy-two million, four hundred seventy-eight thousand, five hundred sixty-three".