172688513 has 2 divisors, whose sum is σ = 172688514. Its totient is φ = 172688512.

The previous prime is 172688497. The next prime is 172688561. The reversal of 172688513 is 315886271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168143089 + 4545424 = 12967^2 + 2132^2 .

It is a cyclic number.

It is not a de Polignac number, because 172688513 - 2⁴ = 172688497 is a prime.

It is not a weakly prime, because it can be changed into another prime (172682513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86344256 + 86344257.

It is an arithmetic number, because the mean of its divisors is an integer number (86344257).

Almost surely, 2^172688513 is an apocalyptic number.

It is an amenable number.

172688513 is a deficient number, since it is larger than the sum of its proper divisors (1).

172688513 is an equidigital number, since it uses as much as digits as its factorization.

172688513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 172688513 is about 13141.1001442041. The cubic root of 172688513 is about 556.8708479635.

The spelling of 172688513 in words is "one hundred seventy-two million, six hundred eighty-eight thousand, five hundred thirteen".