77943361 has 2 divisors, whose sum is σ = 77943362. Its totient is φ = 77943360.

The previous prime is 77943353. The next prime is 77943373. The reversal of 77943361 is 16334977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48566961 + 29376400 = 6969^2 + 5420^2 .

It is a cyclic number.

It is not a de Polignac number, because 77943361 - 2³ = 77943353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77941361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38971680 + 38971681.

It is an arithmetic number, because the mean of its divisors is an integer number (38971681).

Almost surely, 2^77943361 is an apocalyptic number.

It is an amenable number.

77943361 is a deficient number, since it is larger than the sum of its proper divisors (1).

77943361 is an equidigital number, since it uses as much as digits as its factorization.

77943361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 40.

The square root of 77943361 is about 8828.5537320673. The cubic root of 77943361 is about 427.1624247023.

The spelling of 77943361 in words is "seventy-seven million, nine hundred forty-three thousand, three hundred sixty-one".