172023281 has 2 divisors, whose sum is σ = 172023282. Its totient is φ = 172023280.

The previous prime is 172023251. The next prime is 172023311. The reversal of 172023281 is 182320271.

172023281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (172023251) and next prime (172023311).

It can be written as a sum of positive squares in only one way, i.e., 126000625 + 46022656 = 11225^2 + 6784^2 .

It is a cyclic number.

It is not a de Polignac number, because 172023281 - 2⁶ = 172023217 is a prime.

It is a super-2 number, since 2×172023281² = 59184018412009922, which contains 22 as substring.

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 172023281.

It is not a weakly prime, because it can be changed into another prime (172023251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86011640 + 86011641.

It is an arithmetic number, because the mean of its divisors is an integer number (86011641).

Almost surely, 2^172023281 is an apocalyptic number.

It is an amenable number.

172023281 is a deficient number, since it is larger than the sum of its proper divisors (1).

172023281 is an equidigital number, since it uses as much as digits as its factorization.

172023281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 172023281 is about 13115.7645983755. The cubic root of 172023281 is about 556.1548671041.

The spelling of 172023281 in words is "one hundred seventy-two million, twenty-three thousand, two hundred eighty-one".