121131145 has 4 divisors (see below), whose sum is σ = 145357380. Its totient is φ = 96904912.

The previous prime is 121131121. The next prime is 121131149. The reversal of 121131145 is 541131121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38975049 + 82156096 = 6243^2 + 9064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121131145 is a prime.

It is a super-2 number, since 2×121131145² = 29345508578022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121131149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12113110 + ... + 12113119.

It is an arithmetic number, because the mean of its divisors is an integer number (36339345).

Almost surely, 2^121131145 is an apocalyptic number.

It is an amenable number.

121131145 is a deficient number, since it is larger than the sum of its proper divisors (24226235).

121131145 is an equidigital number, since it uses as much as digits as its factorization.

121131145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24226234.

The product of its digits is 120, while the sum is 19.

The square root of 121131145 is about 11005.9595220044. The cubic root of 121131145 is about 494.7873725431.

Adding to 121131145 its reverse (541131121), we get a palindrome (662262266).

The spelling of 121131145 in words is "one hundred twenty-one million, one hundred thirty-one thousand, one hundred forty-five".