172000823 has 2 divisors, whose sum is σ = 172000824. Its totient is φ = 172000822.

The previous prime is 172000729. The next prime is 172000867. The reversal of 172000823 is 328000271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172000823 - 2⁸ = 172000567 is a prime.

It is a super-2 number, since 2×172000823² = 59168566225354658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172009823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86000411 + 86000412.

It is an arithmetic number, because the mean of its divisors is an integer number (86000412).

Almost surely, 2^172000823 is an apocalyptic number.

172000823 is a deficient number, since it is larger than the sum of its proper divisors (1).

172000823 is an equidigital number, since it uses as much as digits as its factorization.

172000823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 172000823 is about 13114.9084251473. The cubic root of 172000823 is about 556.1306636561.

The spelling of 172000823 in words is "one hundred seventy-two million, eight hundred twenty-three", and thus it is an aban number.