121539121 has 4 divisors (see below), whose sum is σ = 132588144. Its totient is φ = 110490100.

The previous prime is 121539101. The next prime is 121539163. The reversal of 121539121 is 121935121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121539121 - 2⁷ = 121538993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121539101) 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, 5524495 + ... + 5524516.

It is an arithmetic number, because the mean of its divisors is an integer number (33147036).

Almost surely, 2^121539121 is an apocalyptic number.

121539121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121539121 is a deficient number, since it is larger than the sum of its proper divisors (11049023).

121539121 is a wasteful number, since it uses less digits than its factorization.

121539121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11049022.

The product of its digits is 540, while the sum is 25.

The square root of 121539121 is about 11024.4782642990. The cubic root of 121539121 is about 495.3422399409.

The spelling of 121539121 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, one hundred twenty-one".