131305121 has 8 divisors (see below), whose sum is σ = 132822144. Its totient is φ = 129792960.

The previous prime is 131305103. The next prime is 131305177. The reversal of 131305121 is 121503131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131305121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131305121.

It is not an unprimeable number, because it can be changed into a prime (131305721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90020 + ... + 91466.

It is an arithmetic number, because the mean of its divisors is an integer number (16602768).

Almost surely, 2^131305121 is an apocalyptic number.

It is an amenable number.

131305121 is a deficient number, since it is larger than the sum of its proper divisors (1517023).

131305121 is a wasteful number, since it uses less digits than its factorization.

131305121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 131305121 is about 11458.8446625303. The cubic root of 131305121 is about 508.2693110328.

Adding to 131305121 its reverse (121503131), we get a palindrome (252808252).

The spelling of 131305121 in words is "one hundred thirty-one million, three hundred five thousand, one hundred twenty-one".