7056521 has 2 divisors, whose sum is σ = 7056522. Its totient is φ = 7056520.

The previous prime is 7056509. The next prime is 7056523. The reversal of 7056521 is 1256507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 1000000 = 2461^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 7056521 - 2⁶ = 7056457 is a prime.

Together with 7056523, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (7056523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3528260 + 3528261.

It is an arithmetic number, because the mean of its divisors is an integer number (3528261).

Almost surely, 2^7056521 is an apocalyptic number.

It is an amenable number.

7056521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7056521 is an equidigital number, since it uses as much as digits as its factorization.

7056521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 7056521 is about 2656.4113009848. The cubic root of 7056521 is about 191.8065995976.

The spelling of 7056521 in words is "seven million, fifty-six thousand, five hundred twenty-one".