172121353 has 2 divisors, whose sum is σ = 172121354. Its totient is φ = 172121352.

The previous prime is 172121309. The next prime is 172121357. The reversal of 172121353 is 353121271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100160064 + 71961289 = 10008^2 + 8483^2 .

It is a cyclic number.

It is not a de Polignac number, because 172121353 - 2⁹ = 172120841 is a prime.

It is not a weakly prime, because it can be changed into another prime (172121357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86060676 + 86060677.

It is an arithmetic number, because the mean of its divisors is an integer number (86060677).

Almost surely, 2^172121353 is an apocalyptic number.

It is an amenable number.

172121353 is a deficient number, since it is larger than the sum of its proper divisors (1).

172121353 is an equidigital number, since it uses as much as digits as its factorization.

172121353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 172121353 is about 13119.5027725901. The cubic root of 172121353 is about 556.2605366350.

The spelling of 172121353 in words is "one hundred seventy-two million, one hundred twenty-one thousand, three hundred fifty-three".