131531403 has 16 divisors (see below), whose sum is σ = 180180000. Its totient is φ = 85297920.

The previous prime is 131531401. The next prime is 131531423. The reversal of 131531403 is 304135131.

It is not a de Polignac number, because 131531403 - 2¹ = 131531401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131531403.

It is not an unprimeable number, because it can be changed into a prime (131531401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46473 + ... + 49221.

It is an arithmetic number, because the mean of its divisors is an integer number (11261250).

Almost surely, 2^131531403 is an apocalyptic number.

131531403 is a deficient number, since it is larger than the sum of its proper divisors (48648597).

131531403 is a wasteful number, since it uses less digits than its factorization.

131531403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 131531403 is about 11468.7140953116. The cubic root of 131531403 is about 508.5611153194.

Adding to 131531403 its reverse (304135131), we get a palindrome (435666534).

The spelling of 131531403 in words is "one hundred thirty-one million, five hundred thirty-one thousand, four hundred three".