7215534509 has 2 divisors, whose sum is σ = 7215534510. Its totient is φ = 7215534508.

The previous prime is 7215534503. The next prime is 7215534523. The reversal of 7215534509 is 9054355127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5126130409 + 2089404100 = 71597^2 + 45710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7215534509 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 (7215534503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607767254 + 3607767255.

It is an arithmetic number, because the mean of its divisors is an integer number (3607767255).

Almost surely, 2^7215534509 is an apocalyptic number.

It is an amenable number.

7215534509 is a deficient number, since it is larger than the sum of its proper divisors (1).

7215534509 is an equidigital number, since it uses as much as digits as its factorization.

7215534509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 7215534509 is about 84944.3023928033. The cubic root of 7215534509 is about 1932.3665127057.

The spelling of 7215534509 in words is "seven billion, two hundred fifteen million, five hundred thirty-four thousand, five hundred nine".