7213897 has 2 divisors, whose sum is σ = 7213898. Its totient is φ = 7213896.

The previous prime is 7213861. The next prime is 7213903. The reversal of 7213897 is 7983127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 767376 = 2539^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 7213897 - 2⁷ = 7213769 is a prime.

It is not a weakly prime, because it can be changed into another prime (7213847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3606948 + 3606949.

It is an arithmetic number, because the mean of its divisors is an integer number (3606949).

Almost surely, 2^7213897 is an apocalyptic number.

It is an amenable number.

7213897 is a deficient number, since it is larger than the sum of its proper divisors (1).

7213897 is an equidigital number, since it uses as much as digits as its factorization.

7213897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 7213897 is about 2685.8698777119. The cubic root of 7213897 is about 193.2220323168. Note that the first 3 decimals are identical.

The spelling of 7213897 in words is "seven million, two hundred thirteen thousand, eight hundred ninety-seven".