7566421 has 2 divisors, whose sum is σ = 7566422. Its totient is φ = 7566420.

The previous prime is 7566413. The next prime is 7566431. The reversal of 7566421 is 1246657.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5904900 + 1661521 = 2430^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 7566421 - 2³ = 7566413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7566431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3783210 + 3783211.

It is an arithmetic number, because the mean of its divisors is an integer number (3783211).

Almost surely, 2^7566421 is an apocalyptic number.

It is an amenable number.

7566421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7566421 is an equidigital number, since it uses as much as digits as its factorization.

7566421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 7566421 is about 2750.7128167077. The cubic root of 7566421 is about 196.3195277468.

The spelling of 7566421 in words is "seven million, five hundred sixty-six thousand, four hundred twenty-one".