172440013 has 2 divisors, whose sum is σ = 172440014. Its totient is φ = 172440012.

The previous prime is 172439989. The next prime is 172440031. The reversal of 172440013 is 310044271.

Together with next prime (172440031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163277284 + 9162729 = 12778^2 + 3027^2 .

It is a cyclic number.

It is not a de Polignac number, because 172440013 - 2²⁵ = 138885581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172440113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86220006 + 86220007.

It is an arithmetic number, because the mean of its divisors is an integer number (86220007).

Almost surely, 2^172440013 is an apocalyptic number.

It is an amenable number.

172440013 is a deficient number, since it is larger than the sum of its proper divisors (1).

172440013 is an equidigital number, since it uses as much as digits as its factorization.

172440013 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 22.

The square root of 172440013 is about 13131.6416719312. The cubic root of 172440013 is about 556.6036060295.

Adding to 172440013 its reverse (310044271), we get a palindrome (482484284).

The spelling of 172440013 in words is "one hundred seventy-two million, four hundred forty thousand, thirteen".