172690253 has 2 divisors, whose sum is σ = 172690254. Its totient is φ = 172690252.

The previous prime is 172690241. The next prime is 172690261. The reversal of 172690253 is 352096271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163916809 + 8773444 = 12803^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 172690253 - 2⁸ = 172689997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172690223) 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, 86345126 + 86345127.

It is an arithmetic number, because the mean of its divisors is an integer number (86345127).

Almost surely, 2^172690253 is an apocalyptic number.

It is an amenable number.

172690253 is a deficient number, since it is larger than the sum of its proper divisors (1).

172690253 is an equidigital number, since it uses as much as digits as its factorization.

172690253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 172690253 is about 13141.1663485400. The cubic root of 172690253 is about 556.8727182906.

The spelling of 172690253 in words is "one hundred seventy-two million, six hundred ninety thousand, two hundred fifty-three".