172648121 has 2 divisors, whose sum is σ = 172648122. Its totient is φ = 172648120.

The previous prime is 172648111. The next prime is 172648123. The reversal of 172648121 is 121846271.

It is a happy number.

172648121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164121721 + 8526400 = 12811^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 172648121 - 2¹⁴ = 172631737 is a prime.

Together with 172648123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172648123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86324060 + 86324061.

It is an arithmetic number, because the mean of its divisors is an integer number (86324061).

Almost surely, 2^172648121 is an apocalyptic number.

It is an amenable number.

172648121 is a deficient number, since it is larger than the sum of its proper divisors (1).

172648121 is an equidigital number, since it uses as much as digits as its factorization.

172648121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 172648121 is about 13139.5631966972. The cubic root of 172648121 is about 556.8274270456.

The spelling of 172648121 in words is "one hundred seventy-two million, six hundred forty-eight thousand, one hundred twenty-one".