131043236521 has 2 divisors, whose sum is σ = 131043236522. Its totient is φ = 131043236520.

The previous prime is 131043236507. The next prime is 131043236551. The reversal of 131043236521 is 125632340131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68925151296 + 62118085225 = 262536^2 + 249235^2 .

It is a cyclic number.

It is not a de Polignac number, because 131043236521 - 2¹⁷ = 131043105449 is a prime.

It is not a weakly prime, because it can be changed into another prime (131043236551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65521618260 + 65521618261.

It is an arithmetic number, because the mean of its divisors is an integer number (65521618261).

Almost surely, 2^131043236521 is an apocalyptic number.

It is an amenable number.

131043236521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131043236521 is an equidigital number, since it uses as much as digits as its factorization.

131043236521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 131043236521 its reverse (125632340131), we get a palindrome (256675576652).

The spelling of 131043236521 in words is "one hundred thirty-one billion, forty-three million, two hundred thirty-six thousand, five hundred twenty-one".