76490221 has 2 divisors, whose sum is σ = 76490222. Its totient is φ = 76490220.

The previous prime is 76490207. The next prime is 76490231. The reversal of 76490221 is 12209467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 2340900 = 8611^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 76490221 - 2⁵ = 76490189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76490201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38245110 + 38245111.

It is an arithmetic number, because the mean of its divisors is an integer number (38245111).

Almost surely, 2^76490221 is an apocalyptic number.

It is an amenable number.

76490221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76490221 is an equidigital number, since it uses as much as digits as its factorization.

76490221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 76490221 is about 8745.8687961803. The cubic root of 76490221 is about 424.4911483201.

Adding to 76490221 its reverse (12209467), we get a palindrome (88699688).

The spelling of 76490221 in words is "seventy-six million, four hundred ninety thousand, two hundred twenty-one".