172201639 has 2 divisors, whose sum is σ = 172201640. Its totient is φ = 172201638.

The previous prime is 172201637. The next prime is 172201643. The reversal of 172201639 is 936102271.

172201639 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 172201639 - 2¹ = 172201637 is a prime.

Together with 172201637, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172201639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172201637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86100819 + 86100820.

It is an arithmetic number, because the mean of its divisors is an integer number (86100820).

Almost surely, 2^172201639 is an apocalyptic number.

172201639 is a deficient number, since it is larger than the sum of its proper divisors (1).

172201639 is an equidigital number, since it uses as much as digits as its factorization.

172201639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 172201639 is about 13122.5622117024. The cubic root of 172201639 is about 556.3470124278.

The spelling of 172201639 in words is "one hundred seventy-two million, two hundred one thousand, six hundred thirty-nine".