172221773 has 2 divisors, whose sum is σ = 172221774. Its totient is φ = 172221772.

The previous prime is 172221739. The next prime is 172221827. The reversal of 172221773 is 377122271.

172221773 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 can be written as a sum of positive squares in only one way, i.e., 159845449 + 12376324 = 12643^2 + 3518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172221773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172221473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86110886 + 86110887.

It is an arithmetic number, because the mean of its divisors is an integer number (86110887).

Almost surely, 2^172221773 is an apocalyptic number.

It is an amenable number.

172221773 is a deficient number, since it is larger than the sum of its proper divisors (1).

172221773 is an equidigital number, since it uses as much as digits as its factorization.

172221773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 32.

The square root of 172221773 is about 13123.3293412914. The cubic root of 172221773 is about 556.3686944789.

The spelling of 172221773 in words is "one hundred seventy-two million, two hundred twenty-one thousand, seven hundred seventy-three".