77563441 has 2 divisors, whose sum is σ = 77563442. Its totient is φ = 77563440.

The previous prime is 77563439. The next prime is 77563459. The reversal of 77563441 is 14436577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 34857216 = 6535^2 + 5904^2 .

It is a cyclic number.

It is not a de Polignac number, because 77563441 - 2¹ = 77563439 is a prime.

Together with 77563439, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77563441.

It is not a weakly prime, because it can be changed into another prime (77563471) 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, 38781720 + 38781721.

It is an arithmetic number, because the mean of its divisors is an integer number (38781721).

Almost surely, 2^77563441 is an apocalyptic number.

It is an amenable number.

77563441 is a deficient number, since it is larger than the sum of its proper divisors (1).

77563441 is an equidigital number, since it uses as much as digits as its factorization.

77563441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 37.

The square root of 77563441 is about 8807.0109004134. The cubic root of 77563441 is about 426.4672534800.

The spelling of 77563441 in words is "seventy-seven million, five hundred sixty-three thousand, four hundred forty-one".