131205403 has 8 divisors (see below), whose sum is σ = 150276608. Its totient is φ = 112216104.

The previous prime is 131205391. The next prime is 131205419. The reversal of 131205403 is 304502131.

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

It is a de Polignac number, because none of the positive numbers 2^k-131205403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131205443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17001 + ... + 23482.

It is an arithmetic number, because the mean of its divisors is an integer number (18784576).

Almost surely, 2^131205403 is an apocalyptic number.

131205403 is a deficient number, since it is larger than the sum of its proper divisors (19071205).

131205403 is an equidigital number, since it uses as much as digits as its factorization.

131205403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40953.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 131205403 is about 11454.4926993735. The cubic root of 131205403 is about 508.1406122318.

Adding to 131205403 its reverse (304502131), we get a palindrome (435707534).

The spelling of 131205403 in words is "one hundred thirty-one million, two hundred five thousand, four hundred three".