131121121 has 2 divisors, whose sum is σ = 131121122. Its totient is φ = 131121120.

The previous prime is 131121113. The next prime is 131121127. The reversal of 131121121 is 121121131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130850721 + 270400 = 11439^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 131121121 - 2³ = 131121113 is a prime.

It is not a weakly prime, because it can be changed into another prime (131121127) 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 as a sum of consecutive naturals, namely, 65560560 + 65560561.

It is an arithmetic number, because the mean of its divisors is an integer number (65560561).

Almost surely, 2^131121121 is an apocalyptic number.

It is an amenable number.

131121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121121 is an equidigital number, since it uses as much as digits as its factorization.

131121121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 13.

The square root of 131121121 is about 11450.8131152333. The cubic root of 131121121 is about 508.0317846998.

Adding to 131121121 its reverse (121121131), we get a palindrome (252242252).

It can be divided in two parts, 131 and 121121, that multiplied together give a palindrome (15866851).

The spelling of 131121121 in words is "one hundred thirty-one million, one hundred twenty-one thousand, one hundred twenty-one".