7128371389 has 2 divisors, whose sum is σ = 7128371390. Its totient is φ = 7128371388.

The previous prime is 7128371321. The next prime is 7128371441. The reversal of 7128371389 is 9831738217.

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., 5753222500 + 1375148889 = 75850^2 + 37083^2 .

It is a cyclic number.

It is not a de Polignac number, because 7128371389 - 2⁹ = 7128370877 is a prime.

It is a super-5 number, since 5×7128371389⁵ (a number of 50 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7128374389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564185694 + 3564185695.

It is an arithmetic number, because the mean of its divisors is an integer number (3564185695).

Almost surely, 2^7128371389 is an apocalyptic number.

It is an amenable number.

7128371389 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128371389 is an equidigital number, since it uses as much as digits as its factorization.

7128371389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 7128371389 is about 84429.6831037521. The cubic root of 7128371389 is about 1924.5540217427.

The spelling of 7128371389 in words is "seven billion, one hundred twenty-eight million, three hundred seventy-one thousand, three hundred eighty-nine".