172201643 has 2 divisors, whose sum is σ = 172201644. Its totient is φ = 172201642.

The previous prime is 172201639. The next prime is 172201649. The reversal of 172201643 is 346102271.

172201643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172201643 - 2² = 172201639 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (172201649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86100821 + 86100822.

It is an arithmetic number, because the mean of its divisors is an integer number (86100822).

Almost surely, 2^172201643 is an apocalyptic number.

172201643 is a deficient number, since it is larger than the sum of its proper divisors (1).

172201643 is an equidigital number, since it uses as much as digits as its factorization.

172201643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 172201643 is about 13122.5623641117. The cubic root of 172201643 is about 556.3470167355.

The spelling of 172201643 in words is "one hundred seventy-two million, two hundred one thousand, six hundred forty-three".