77639101 has 2 divisors, whose sum is σ = 77639102. Its totient is φ = 77639100.

The previous prime is 77639063. The next prime is 77639141. The reversal of 77639101 is 10193677.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39075001 + 38564100 = 6251^2 + 6210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77639101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77639141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38819550 + 38819551.

It is an arithmetic number, because the mean of its divisors is an integer number (38819551).

Almost surely, 2^77639101 is an apocalyptic number.

It is an amenable number.

77639101 is a deficient number, since it is larger than the sum of its proper divisors (1).

77639101 is an equidigital number, since it uses as much as digits as its factorization.

77639101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 77639101 is about 8811.3052949038. The cubic root of 77639101 is about 426.6058756027.

The spelling of 77639101 in words is "seventy-seven million, six hundred thirty-nine thousand, one hundred one".