172420733 has 2 divisors, whose sum is σ = 172420734. Its totient is φ = 172420732.

The previous prime is 172420691. The next prime is 172420751. The reversal of 172420733 is 337024271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 33605209 = 11782^2 + 5797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172420733 is a prime.

It is a Chen prime.

It is equal to p_9630911 and since 172420733 and 9630911 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 172420696 and 172420705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172420793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86210366 + 86210367.

It is an arithmetic number, because the mean of its divisors is an integer number (86210367).

Almost surely, 2^172420733 is an apocalyptic number.

It is an amenable number.

172420733 is a deficient number, since it is larger than the sum of its proper divisors (1).

172420733 is an equidigital number, since it uses as much as digits as its factorization.

172420733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 172420733 is about 13130.9075467006. The cubic root of 172420733 is about 556.5828611971.

The spelling of 172420733 in words is "one hundred seventy-two million, four hundred twenty thousand, seven hundred thirty-three".