77444249 has 2 divisors, whose sum is σ = 77444250. Its totient is φ = 77444248.

The previous prime is 77444221. The next prime is 77444251. The reversal of 77444249 is 94244477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 23348224 = 7355^2 + 4832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77444249 is a prime.

It is a super-2 number, since 2×77444249² = 11995223406348002, which contains 22 as substring.

Together with 77444251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77441249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38722124 + 38722125.

It is an arithmetic number, because the mean of its divisors is an integer number (38722125).

Almost surely, 2^77444249 is an apocalyptic number.

It is an amenable number.

77444249 is a deficient number, since it is larger than the sum of its proper divisors (1).

77444249 is an equidigital number, since it uses as much as digits as its factorization.

77444249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 41.

The square root of 77444249 is about 8800.2414171431. The cubic root of 77444249 is about 426.2486902664.

The spelling of 77444249 in words is "seventy-seven million, four hundred forty-four thousand, two hundred forty-nine".