131366403 has 36 divisors (see below), whose sum is σ = 223278120. Its totient is φ = 74200896.

The previous prime is 131366393. The next prime is 131366441. The reversal of 131366403 is 304663131.

131366403 is a `hidden beast` number, since 1 + 3 + 13 + 6 + 640 + 3 = 666.

It is not a de Polignac number, because 131366403 - 2⁵ = 131366371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131366483) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 37576 + ... + 40922.

It is an arithmetic number, because the mean of its divisors is an integer number (6202170).

Almost surely, 2^131366403 is an apocalyptic number.

131366403 is a deficient number, since it is larger than the sum of its proper divisors (91911717).

131366403 is a wasteful number, since it uses less digits than its factorization.

131366403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456 (or 3446 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 131366403 is about 11461.5183549127. The cubic root of 131366403 is about 508.3483709487.

It can be divided in two parts, 131366 and 403, that added together give a square (131769 = 363²).

The spelling of 131366403 in words is "one hundred thirty-one million, three hundred sixty-six thousand, four hundred three".