131403321 has 48 divisors (see below), whose sum is σ = 227784960. Its totient is φ = 71406720.

The previous prime is 131403299. The next prime is 131403331. The reversal of 131403321 is 123304131.

It is not a de Polignac number, because 131403321 - 2¹⁵ = 131370553 is a prime.

131403321 is a modest number, since divided by 3321 gives 1314 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 131403294 and 131403303.

It is not an unprimeable number, because it can be changed into a prime (131403331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129211 + ... + 130223.

It is an arithmetic number, because the mean of its divisors is an integer number (4745520).

Almost surely, 2^131403321 is an apocalyptic number.

It is an amenable number.

131403321 is a deficient number, since it is larger than the sum of its proper divisors (96381639).

131403321 is a wasteful number, since it uses less digits than its factorization.

131403321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131403321 is about 11463.1287613810. The cubic root of 131403321 is about 508.3959869981.

Adding to 131403321 its reverse (123304131), we get a palindrome (254707452).

It can be divided in two parts, 13140 and 3321, that added together give a palindrome (16461).

The spelling of 131403321 in words is "one hundred thirty-one million, four hundred three thousand, three hundred twenty-one".