77144401 has 2 divisors, whose sum is σ = 77144402. Its totient is φ = 77144400.

The previous prime is 77144383. The next prime is 77144449. The reversal of 77144401 is 10444177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 15992001 = 7820^2 + 3999^2 .

It is an emirp because it is prime and its reverse (10444177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77144401 - 2⁹ = 77143889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77144401.

It is not a weakly prime, because it can be changed into another prime (77144471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38572200 + 38572201.

It is an arithmetic number, because the mean of its divisors is an integer number (38572201).

Almost surely, 2^77144401 is an apocalyptic number.

It is an amenable number.

77144401 is a deficient number, since it is larger than the sum of its proper divisors (1).

77144401 is an equidigital number, since it uses as much as digits as its factorization.

77144401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 77144401 is about 8783.1885440311. The cubic root of 77144401 is about 425.6978633784.

Adding to 77144401 its reverse (10444177), we get a palindrome (87588578).

The spelling of 77144401 in words is "seventy-seven million, one hundred forty-four thousand, four hundred one".