77229797 has 2 divisors, whose sum is σ = 77229798. Its totient is φ = 77229796.

The previous prime is 77229787. The next prime is 77229863. The reversal of 77229797 is 79792277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 9431041 = 8234^2 + 3071^2 .

It is an emirp because it is prime and its reverse (79792277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77229797 - 2⁸ = 77229541 is a prime.

It is a super-2 number, since 2×77229797² = 11928883089322418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77229727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38614898 + 38614899.

It is an arithmetic number, because the mean of its divisors is an integer number (38614899).

Almost surely, 2^77229797 is an apocalyptic number.

It is an amenable number.

77229797 is a deficient number, since it is larger than the sum of its proper divisors (1).

77229797 is an equidigital number, since it uses as much as digits as its factorization.

77229797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777924, while the sum is 50.

The square root of 77229797 is about 8788.0485319552. The cubic root of 77229797 is about 425.8548827203.

The spelling of 77229797 in words is "seventy-seven million, two hundred twenty-nine thousand, seven hundred ninety-seven".