77779241 has 2 divisors, whose sum is σ = 77779242. Its totient is φ = 77779240.

The previous prime is 77779231. The next prime is 77779253. The reversal of 77779241 is 14297777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 35581225 = 6496^2 + 5965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77779241 is a prime.

It is a super-2 number, since 2×77779241² = 12099220661072162, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77779192 and 77779201.

It is not a weakly prime, because it can be changed into another prime (77779231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38889620 + 38889621.

It is an arithmetic number, because the mean of its divisors is an integer number (38889621).

Almost surely, 2^77779241 is an apocalyptic number.

It is an amenable number.

77779241 is a deficient number, since it is larger than the sum of its proper divisors (1).

77779241 is an equidigital number, since it uses as much as digits as its factorization.

77779241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 44.

The square root of 77779241 is about 8819.2539933942. The cubic root of 77779241 is about 426.8623984627.

The spelling of 77779241 in words is "seventy-seven million, seven hundred seventy-nine thousand, two hundred forty-one".