172521241 has 2 divisors, whose sum is σ = 172521242. Its totient is φ = 172521240.

The previous prime is 172521191. The next prime is 172521263. The reversal of 172521241 is 142125271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107557641 + 64963600 = 10371^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 172521241 - 2¹⁹ = 171996953 is a prime.

It is not a weakly prime, because it can be changed into another prime (172524241) 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, 86260620 + 86260621.

It is an arithmetic number, because the mean of its divisors is an integer number (86260621).

Almost surely, 2^172521241 is an apocalyptic number.

It is an amenable number.

172521241 is a deficient number, since it is larger than the sum of its proper divisors (1).

172521241 is an equidigital number, since it uses as much as digits as its factorization.

172521241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 172521241 is about 13134.7341427225. The cubic root of 172521241 is about 556.6909884951.

The spelling of 172521241 in words is "one hundred seventy-two million, five hundred twenty-one thousand, two hundred forty-one".