131121233 has 4 divisors (see below), whose sum is σ = 134170608. Its totient is φ = 128071860.

The previous prime is 131121181. The next prime is 131121241. The reversal of 131121233 is 332121131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131121233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131121253) 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, 1524623 + ... + 1524708.

It is an arithmetic number, because the mean of its divisors is an integer number (33542652).

Almost surely, 2^131121233 is an apocalyptic number.

It is an amenable number.

131121233 is a deficient number, since it is larger than the sum of its proper divisors (3049375).

131121233 is an equidigital number, since it uses as much as digits as its factorization.

131121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049374.

The product of its digits is 108, while the sum is 17.

The square root of 131121233 is about 11450.8180057147. The cubic root of 131121233 is about 508.0319293486.

Adding to 131121233 its reverse (332121131), we get a palindrome (463242364).

The spelling of 131121233 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-three".