76257221 has 2 divisors, whose sum is σ = 76257222. Its totient is φ = 76257220.

The previous prime is 76257197. The next prime is 76257227. The reversal of 76257221 is 12275267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 37332100 = 6239^2 + 6110^2 .

It is a cyclic number.

It is not a de Polignac number, because 76257221 - 2²² = 72062917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76257227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38128610 + 38128611.

It is an arithmetic number, because the mean of its divisors is an integer number (38128611).

Almost surely, 2^76257221 is an apocalyptic number.

It is an amenable number.

76257221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76257221 is an equidigital number, since it uses as much as digits as its factorization.

76257221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 76257221 is about 8732.5380617550. The cubic root of 76257221 is about 424.0596899619.

The spelling of 76257221 in words is "seventy-six million, two hundred fifty-seven thousand, two hundred twenty-one".