77123213 has 2 divisors, whose sum is σ = 77123214. Its totient is φ = 77123212.

The previous prime is 77123183. The next prime is 77123219. The reversal of 77123213 is 31232177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42994249 + 34128964 = 6557^2 + 5842^2 .

It is an emirp because it is prime and its reverse (31232177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77123213 - 2¹⁸ = 76861069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77123219) 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, 38561606 + 38561607.

It is an arithmetic number, because the mean of its divisors is an integer number (38561607).

Almost surely, 2^77123213 is an apocalyptic number.

It is an amenable number.

77123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

77123213 is an equidigital number, since it uses as much as digits as its factorization.

77123213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 26.

The square root of 77123213 is about 8781.9822933094. The cubic root of 77123213 is about 425.6588866365.

The spelling of 77123213 in words is "seventy-seven million, one hundred twenty-three thousand, two hundred thirteen".