77212957 has 2 divisors, whose sum is σ = 77212958. Its totient is φ = 77212956.

The previous prime is 77212943. The next prime is 77212973. The reversal of 77212957 is 75921277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75933796 + 1279161 = 8714^2 + 1131^2 .

It is an emirp because it is prime and its reverse (75921277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77212957 - 2⁷ = 77212829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77212987) 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, 38606478 + 38606479.

It is an arithmetic number, because the mean of its divisors is an integer number (38606479).

Almost surely, 2^77212957 is an apocalyptic number.

It is an amenable number.

77212957 is a deficient number, since it is larger than the sum of its proper divisors (1).

77212957 is an equidigital number, since it uses as much as digits as its factorization.

77212957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 40.

The square root of 77212957 is about 8787.0903602956. The cubic root of 77212957 is about 425.8239278392.

The spelling of 77212957 in words is "seventy-seven million, two hundred twelve thousand, nine hundred fifty-seven".