76841221 has 2 divisors, whose sum is σ = 76841222. Its totient is φ = 76841220.

The previous prime is 76841189. The next prime is 76841227. The reversal of 76841221 is 12214867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48804196 + 28037025 = 6986^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 76841221 - 2⁵ = 76841189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76841227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38420610 + 38420611.

It is an arithmetic number, because the mean of its divisors is an integer number (38420611).

Almost surely, 2^76841221 is an apocalyptic number.

It is an amenable number.

76841221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76841221 is an equidigital number, since it uses as much as digits as its factorization.

76841221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 76841221 is about 8765.9124453761. The cubic root of 76841221 is about 425.1394624200.

The spelling of 76841221 in words is "seventy-six million, eight hundred forty-one thousand, two hundred twenty-one".