7131948174821 has 2 divisors, whose sum is σ = 7131948174822. Its totient is φ = 7131948174820.

The previous prime is 7131948174787. The next prime is 7131948174851. The reversal of 7131948174821 is 1284718491317.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5426286054721 + 1705662120100 = 2329439^2 + 1306010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7131948174821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7131948174851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3565974087410 + 3565974087411.

It is an arithmetic number, because the mean of its divisors is an integer number (3565974087411).

Almost surely, 2^{7131948174821} is an apocalyptic number.

It is an amenable number.

7131948174821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7131948174821 is an equidigital number, since it uses as much as digits as its factorization.

7131948174821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The spelling of 7131948174821 in words is "seven trillion, one hundred thirty-one billion, nine hundred forty-eight million, one hundred seventy-four thousand, eight hundred twenty-one".