131403421 has 4 divisors (see below), whose sum is σ = 139133052. Its totient is φ = 123673792.

The previous prime is 131403397. The next prime is 131403457. The reversal of 131403421 is 124304131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73719396 + 57684025 = 8586^2 + 7595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131403421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131403491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3864790 + ... + 3864823.

It is an arithmetic number, because the mean of its divisors is an integer number (34783263).

Almost surely, 2^131403421 is an apocalyptic number.

It is an amenable number.

131403421 is a deficient number, since it is larger than the sum of its proper divisors (7729631).

131403421 is an equidigital number, since it uses as much as digits as its factorization.

131403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729630.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 131403421 is about 11463.1331231911. The cubic root of 131403421 is about 508.3961159638.

Adding to 131403421 its reverse (124304131), we get a palindrome (255707552).

It can be divided in two parts, 13140 and 3421, that added together give a palindrome (16561).

The spelling of 131403421 in words is "one hundred thirty-one million, four hundred three thousand, four hundred twenty-one".