7215520397 has 2 divisors, whose sum is σ = 7215520398. Its totient is φ = 7215520396.

The previous prime is 7215520387. The next prime is 7215520399. The reversal of 7215520397 is 7930255127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7172565481 + 42954916 = 84691^2 + 6554^2 .

It is a cyclic number.

It is not a de Polignac number, because 7215520397 - 2¹⁴ = 7215504013 is a prime.

Together with 7215520399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7215520399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607760198 + 3607760199.

It is an arithmetic number, because the mean of its divisors is an integer number (3607760199).

Almost surely, 2^7215520397 is an apocalyptic number.

It is an amenable number.

7215520397 is a deficient number, since it is larger than the sum of its proper divisors (1).

7215520397 is an equidigital number, since it uses as much as digits as its factorization.

7215520397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 7215520397 is about 84944.2193265675. The cubic root of 7215520397 is about 1932.3652529435.

The spelling of 7215520397 in words is "seven billion, two hundred fifteen million, five hundred twenty thousand, three hundred ninety-seven".