172521743 has 2 divisors, whose sum is σ = 172521744. Its totient is φ = 172521742.

The previous prime is 172521709. The next prime is 172521749. The reversal of 172521743 is 347125271.

It is a strong prime.

It is an emirp because it is prime and its reverse (347125271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172521743 - 2¹² = 172517647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172521749) 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, 86260871 + 86260872.

It is an arithmetic number, because the mean of its divisors is an integer number (86260872).

Almost surely, 2^172521743 is an apocalyptic number.

172521743 is a deficient number, since it is larger than the sum of its proper divisors (1).

172521743 is an equidigital number, since it uses as much as digits as its factorization.

172521743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 32.

The square root of 172521743 is about 13134.7532523455. The cubic root of 172521743 is about 556.6915284453.

The spelling of 172521743 in words is "one hundred seventy-two million, five hundred twenty-one thousand, seven hundred forty-three".