121540871 has 4 divisors (see below), whose sum is σ = 128690352. Its totient is φ = 114391392.

The previous prime is 121540849. The next prime is 121540877. The reversal of 121540871 is 178045121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121540871 - 2⁶ = 121540807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3574715 + ... + 3574748.

It is an arithmetic number, because the mean of its divisors is an integer number (32172588).

Almost surely, 2^121540871 is an apocalyptic number.

121540871 is a deficient number, since it is larger than the sum of its proper divisors (7149481).

121540871 is an equidigital number, since it uses as much as digits as its factorization.

121540871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149480.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 121540871 is about 11024.5576328486. The cubic root of 121540871 is about 495.3446173504.

Adding to 121540871 its reverse (178045121), we get a palindrome (299585992).

The spelling of 121540871 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred seventy-one".