172309799 has 2 divisors, whose sum is σ = 172309800. Its totient is φ = 172309798.

The previous prime is 172309783. The next prime is 172309801. The reversal of 172309799 is 997903271.

172309799 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 is a cyclic number.

It is not a de Polignac number, because 172309799 - 2⁴ = 172309783 is a prime.

Together with 172309801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172309759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86154899 + 86154900.

It is an arithmetic number, because the mean of its divisors is an integer number (86154900).

Almost surely, 2^172309799 is an apocalyptic number.

172309799 is a deficient number, since it is larger than the sum of its proper divisors (1).

172309799 is an equidigital number, since it uses as much as digits as its factorization.

172309799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 172309799 is about 13126.6827111803. The cubic root of 172309799 is about 556.4634687307.

The spelling of 172309799 in words is "one hundred seventy-two million, three hundred nine thousand, seven hundred ninety-nine".