172072517 has 2 divisors, whose sum is σ = 172072518. Its totient is φ = 172072516.

The previous prime is 172072513. The next prime is 172072553. The reversal of 172072517 is 715270271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141943396 + 30129121 = 11914^2 + 5489^2 .

It is an emirp because it is prime and its reverse (715270271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172072517 - 2² = 172072513 is a prime.

It is a super-2 number, since 2×172072517² = 59217902213430578, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172072513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86036258 + 86036259.

It is an arithmetic number, because the mean of its divisors is an integer number (86036259).

Almost surely, 2^172072517 is an apocalyptic number.

It is an amenable number.

172072517 is a deficient number, since it is larger than the sum of its proper divisors (1).

172072517 is an equidigital number, since it uses as much as digits as its factorization.

172072517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 172072517 is about 13117.6414419666. The cubic root of 172072517 is about 556.2079223821.

The spelling of 172072517 in words is "one hundred seventy-two million, seventy-two thousand, five hundred seventeen".