121313131 has 4 divisors (see below), whose sum is σ = 123602112. Its totient is φ = 119024152.

The previous prime is 121313123. The next prime is 121313149. The reversal of 121313131 is 131313121.

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

It is a cyclic number.

It is not a de Polignac number, because 121313131 - 2³ = 121313123 is a prime.

It is a super-2 number, since 2×121313131² = 29433751506046322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121313531) 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, 1144411 + ... + 1144516.

It is an arithmetic number, because the mean of its divisors is an integer number (30900528).

Almost surely, 2^121313131 is an apocalyptic number.

121313131 is a deficient number, since it is larger than the sum of its proper divisors (2288981).

121313131 is an equidigital number, since it uses as much as digits as its factorization.

121313131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288980.

The product of its digits is 54, while the sum is 16.

The square root of 121313131 is about 11014.2240307704. The cubic root of 121313131 is about 495.0350361216.

Adding to 121313131 its reverse (131313121), we get a palindrome (252626252).

The spelling of 121313131 in words is "one hundred twenty-one million, three hundred thirteen thousand, one hundred thirty-one".