7131668549 has 2 divisors, whose sum is σ = 7131668550. Its totient is φ = 7131668548.

The previous prime is 7131668527. The next prime is 7131668597. The reversal of 7131668549 is 9458661317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6999832225 + 131836324 = 83665^2 + 11482^2 .

It is a cyclic number.

It is not a de Polignac number, because 7131668549 - 2¹² = 7131664453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7131668497 and 7131668506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7131668519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3565834274 + 3565834275.

It is an arithmetic number, because the mean of its divisors is an integer number (3565834275).

Almost surely, 2^7131668549 is an apocalyptic number.

It is an amenable number.

7131668549 is a deficient number, since it is larger than the sum of its proper divisors (1).

7131668549 is an equidigital number, since it uses as much as digits as its factorization.

7131668549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 7131668549 is about 84449.2069175312. The cubic root of 7131668549 is about 1924.8507040227.

The spelling of 7131668549 in words is "seven billion, one hundred thirty-one million, six hundred sixty-eight thousand, five hundred forty-nine".