131240761 has 2 divisors, whose sum is σ = 131240762. Its totient is φ = 131240760.

The previous prime is 131240723. The next prime is 131240777. The reversal of 131240761 is 167042131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130965136 + 275625 = 11444^2 + 525^2 .

It is an emirp because it is prime and its reverse (167042131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131240761 - 2⁷ = 131240633 is a prime.

It is not a weakly prime, because it can be changed into another prime (131240861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65620380 + 65620381.

It is an arithmetic number, because the mean of its divisors is an integer number (65620381).

Almost surely, 2^131240761 is an apocalyptic number.

It is an amenable number.

131240761 is a deficient number, since it is larger than the sum of its proper divisors (1).

131240761 is an equidigital number, since it uses as much as digits as its factorization.

131240761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 131240761 is about 11456.0360072758. The cubic root of 131240761 is about 508.1862537010.

Adding to 131240761 its reverse (167042131), we get a palindrome (298282892).

The spelling of 131240761 in words is "one hundred thirty-one million, two hundred forty thousand, seven hundred sixty-one".