39172513 has 2 divisors, whose sum is σ = 39172514. Its totient is φ = 39172512.

The previous prime is 39172493. The next prime is 39172517. The reversal of 39172513 is 31527193.

39172513 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 can be written as a sum of positive squares in only one way, i.e., 38031889 + 1140624 = 6167^2 + 1068^2 .

It is an emirp because it is prime and its reverse (31527193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39172513 - 2⁵ = 39172481 is a prime.

It is not a weakly prime, because it can be changed into another prime (39172517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19586256 + 19586257.

It is an arithmetic number, because the mean of its divisors is an integer number (19586257).

Almost surely, 2^39172513 is an apocalyptic number.

It is an amenable number.

39172513 is a deficient number, since it is larger than the sum of its proper divisors (1).

39172513 is an equidigital number, since it uses as much as digits as its factorization.

39172513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 31.

The square root of 39172513 is about 6258.7948520462. The cubic root of 39172513 is about 339.6204328201.

The spelling of 39172513 in words is "thirty-nine million, one hundred seventy-two thousand, five hundred thirteen".