121331251 has 8 divisors (see below), whose sum is σ = 127510064. Its totient is φ = 115305120.

The previous prime is 121331239. The next prime is 121331267. The reversal of 121331251 is 152133121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121331251 - 2¹¹ = 121329203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121331851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36540 + ... + 39721.

It is an arithmetic number, because the mean of its divisors is an integer number (15938758).

Almost surely, 2^121331251 is an apocalyptic number.

121331251 is a deficient number, since it is larger than the sum of its proper divisors (6178813).

121331251 is an equidigital number, since it uses as much as digits as its factorization.

121331251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76341.

The product of its digits is 180, while the sum is 19.

The square root of 121331251 is about 11015.0465727567. The cubic root of 121331251 is about 495.0596819512.

Adding to 121331251 its reverse (152133121), we get a palindrome (273464372).

The spelling of 121331251 in words is "one hundred twenty-one million, three hundred thirty-one thousand, two hundred fifty-one".