76247221 has 2 divisors, whose sum is σ = 76247222. Its totient is φ = 76247220.

The previous prime is 76247219. The next prime is 76247233. The reversal of 76247221 is 12274267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 17892900 = 7639^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 76247221 - 2¹ = 76247219 is a prime.

Together with 76247219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76247291) 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, 38123610 + 38123611.

It is an arithmetic number, because the mean of its divisors is an integer number (38123611).

Almost surely, 2^76247221 is an apocalyptic number.

It is an amenable number.

76247221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76247221 is an equidigital number, since it uses as much as digits as its factorization.

76247221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 31.

The square root of 76247221 is about 8731.9654717595. The cubic root of 76247221 is about 424.0411527785.

The spelling of 76247221 in words is "seventy-six million, two hundred forty-seven thousand, two hundred twenty-one".