172781393 has 2 divisors, whose sum is σ = 172781394. Its totient is φ = 172781392.

The previous prime is 172781381. The next prime is 172781429. The reversal of 172781393 is 393187271.

172781393 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., 149035264 + 23746129 = 12208^2 + 4873^2 .

It is a cyclic number.

It is not a de Polignac number, because 172781393 - 2⁴ = 172781377 is a prime.

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 172781393.

It is not a weakly prime, because it can be changed into another prime (172781893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86390696 + 86390697.

It is an arithmetic number, because the mean of its divisors is an integer number (86390697).

Almost surely, 2^172781393 is an apocalyptic number.

It is an amenable number.

172781393 is a deficient number, since it is larger than the sum of its proper divisors (1).

172781393 is an equidigital number, since it uses as much as digits as its factorization.

172781393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 172781393 is about 13144.6336198465. The cubic root of 172781393 is about 556.9706671762.

The spelling of 172781393 in words is "one hundred seventy-two million, seven hundred eighty-one thousand, three hundred ninety-three".