7128529 has 2 divisors, whose sum is σ = 7128530. Its totient is φ = 7128528.

The previous prime is 7128509. The next prime is 7128533. The reversal of 7128529 is 9258217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 2634129 = 2120^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 7128529 - 2¹⁵ = 7095761 is a prime.

It is an Ulam number.

7128529 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7128494 and 7128503.

It is not a weakly prime, because it can be changed into another prime (7128509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564264 + 3564265.

It is an arithmetic number, because the mean of its divisors is an integer number (3564265).

Almost surely, 2^7128529 is an apocalyptic number.

It is an amenable number.

7128529 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128529 is an equidigital number, since it uses as much as digits as its factorization.

7128529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 7128529 is about 2669.9305234406. The cubic root of 7128529 is about 192.4568205845.

The spelling of 7128529 in words is "seven million, one hundred twenty-eight thousand, five hundred twenty-nine".