172679993 has 2 divisors, whose sum is σ = 172679994. Its totient is φ = 172679992.

The previous prime is 172679957. The next prime is 172680019. The reversal of 172679993 is 399976271.

It is a happy number.

172679993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172475689 + 204304 = 13133^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 172679993 - 2¹² = 172675897 is a prime.

It is not a weakly prime, because it can be changed into another prime (172679293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86339996 + 86339997.

It is an arithmetic number, because the mean of its divisors is an integer number (86339997).

Almost surely, 2^172679993 is an apocalyptic number.

It is an amenable number.

172679993 is a deficient number, since it is larger than the sum of its proper divisors (1).

172679993 is an equidigital number, since it uses as much as digits as its factorization.

172679993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1285956, while the sum is 53.

The square root of 172679993 is about 13140.7759664336. The cubic root of 172679993 is about 556.8616896287.

The spelling of 172679993 in words is "one hundred seventy-two million, six hundred seventy-nine thousand, nine hundred ninety-three".