131003515421 has 4 divisors (see below), whose sum is σ = 131055482844. Its totient is φ = 130951548000.

The previous prime is 131003515403. The next prime is 131003515439. The reversal of 131003515421 is 124515300131.

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

It is an interprime number because it is at equal distance from previous prime (131003515403) and next prime (131003515439).

It can be written as a sum of positive squares in 2 ways, for example, as 50889043396 + 80114472025 = 225586^2 + 283045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131003515421 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 (131003515471) 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, 25979930 + ... + 25984971.

It is an arithmetic number, because the mean of its divisors is an integer number (32763870711).

Almost surely, 2^131003515421 is an apocalyptic number.

It is an amenable number.

131003515421 is a deficient number, since it is larger than the sum of its proper divisors (51967423).

131003515421 is an equidigital number, since it uses as much as digits as its factorization.

131003515421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51967422.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 131003515421 its reverse (124515300131), we get a palindrome (255518815552).

The spelling of 131003515421 in words is "one hundred thirty-one billion, three million, five hundred fifteen thousand, four hundred twenty-one".