172455421 has 2 divisors, whose sum is σ = 172455422. Its totient is φ = 172455420.

The previous prime is 172455397. The next prime is 172455433. The reversal of 172455421 is 124554271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 25100100 = 12139^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 172455421 - 2¹³ = 172447229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172459421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86227710 + 86227711.

It is an arithmetic number, because the mean of its divisors is an integer number (86227711).

Almost surely, 2^172455421 is an apocalyptic number.

It is an amenable number.

172455421 is a deficient number, since it is larger than the sum of its proper divisors (1).

172455421 is an equidigital number, since it uses as much as digits as its factorization.

172455421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11200, while the sum is 31.

The square root of 172455421 is about 13132.2283333789. The cubic root of 172455421 is about 556.6201835681.

The spelling of 172455421 in words is "one hundred seventy-two million, four hundred fifty-five thousand, four hundred twenty-one".