121540171 has 2 divisors, whose sum is σ = 121540172. Its totient is φ = 121540170.

The previous prime is 121540163. The next prime is 121540187. The reversal of 121540171 is 171045121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121540171 - 2³ = 121540163 is a prime.

It is not a weakly prime, because it can be changed into another prime (121540271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770085 + 60770086.

It is an arithmetic number, because the mean of its divisors is an integer number (60770086).

Almost surely, 2^121540171 is an apocalyptic number.

121540171 is a deficient number, since it is larger than the sum of its proper divisors (1).

121540171 is an equidigital number, since it uses as much as digits as its factorization.

121540171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 121540171 is about 11024.5258854973. The cubic root of 121540171 is about 495.3436663893.

Multiplying 121540171 by its sum of digits (22), we get a palindrome (2673883762).

Adding to 121540171 its reverse (171045121), we get a palindrome (292585292).

The spelling of 121540171 in words is "one hundred twenty-one million, five hundred forty thousand, one hundred seventy-one".