121311131 has 4 divisors (see below), whose sum is σ = 126585552. Its totient is φ = 116036712.

The previous prime is 121311121. The next prime is 121311137. The reversal of 121311131 is 131113121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131113121 = 41 ⋅3197881.

It is a cyclic number.

It is not a de Polignac number, because 121311131 - 2¹⁰ = 121310107 is a prime.

It is a super-2 number, since 2×121311131² = 29432781008998322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121311137) 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 3 ways as a sum of consecutive naturals, for example, 2637176 + ... + 2637221.

It is an arithmetic number, because the mean of its divisors is an integer number (31646388).

Almost surely, 2^121311131 is an apocalyptic number.

121311131 is a deficient number, since it is larger than the sum of its proper divisors (5274421).

121311131 is an equidigital number, since it uses as much as digits as its factorization.

121311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274420.

The product of its digits is 18, while the sum is 14.

The square root of 121311131 is about 11014.1332387074. The cubic root of 121311131 is about 495.0323156810.

Adding to 121311131 its reverse (131113121), we get a palindrome (252424252).

The spelling of 121311131 in words is "one hundred twenty-one million, three hundred eleven thousand, one hundred thirty-one".