131280404521 has 6 divisors (see below), whose sum is σ = 152713940010. Its totient is φ = 112526060976.

The previous prime is 131280404503. The next prime is 131280404531. The reversal of 131280404521 is 125404082131.

It can be written as a sum of positive squares in only one way, i.e., 96714158121 + 34566246400 = 310989^2 + 185920^2 .

It is not a de Polignac number, because 131280404521 - 2⁹ = 131280404009 is a prime.

It is a super-2 number, since 2×131280404521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131280404531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1339595916 + ... + 1339596013.

It is an arithmetic number, because the mean of its divisors is an integer number (25452323335).

Almost surely, 2^131280404521 is an apocalyptic number.

It is an amenable number.

131280404521 is a deficient number, since it is larger than the sum of its proper divisors (21433535489).

131280404521 is an equidigital number, since it uses as much as digits as its factorization.

131280404521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679191943 (or 2679191936 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 131280404521 its reverse (125404082131), we get a palindrome (256684486652).

The spelling of 131280404521 in words is "one hundred thirty-one billion, two hundred eighty million, four hundred four thousand, five hundred twenty-one".