172515493 has 2 divisors, whose sum is σ = 172515494. Its totient is φ = 172515492.

The previous prime is 172515487. The next prime is 172515523. The reversal of 172515493 is 394515271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86434209 + 86081284 = 9297^2 + 9278^2 .

It is a cyclic number.

It is not a de Polignac number, because 172515493 - 2⁹ = 172514981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172515463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86257746 + 86257747.

It is an arithmetic number, because the mean of its divisors is an integer number (86257747).

Almost surely, 2^172515493 is an apocalyptic number.

It is an amenable number.

172515493 is a deficient number, since it is larger than the sum of its proper divisors (1).

172515493 is an equidigital number, since it uses as much as digits as its factorization.

172515493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 172515493 is about 13134.5153317509. The cubic root of 172515493 is about 556.6848058838.

The spelling of 172515493 in words is "one hundred seventy-two million, five hundred fifteen thousand, four hundred ninety-three".