121531171 has 2 divisors, whose sum is σ = 121531172. Its totient is φ = 121531170.

The previous prime is 121531159. The next prime is 121531177. The reversal of 121531171 is 171135121.

It is a strong prime.

It is an emirp because it is prime and its reverse (171135121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121531171 - 2⁹ = 121530659 is a prime.

It is not a weakly prime, because it can be changed into another prime (121531177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60765585 + 60765586.

It is an arithmetic number, because the mean of its divisors is an integer number (60765586).

Almost surely, 2^121531171 is an apocalyptic number.

121531171 is a deficient number, since it is larger than the sum of its proper divisors (1).

121531171 is an equidigital number, since it uses as much as digits as its factorization.

121531171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210, while the sum is 22.

The square root of 121531171 is about 11024.1176971221. The cubic root of 121531171 is about 495.3314394221.

Adding to 121531171 its reverse (171135121), we get a palindrome (292666292).

The spelling of 121531171 in words is "one hundred twenty-one million, five hundred thirty-one thousand, one hundred seventy-one".