77120101 has 4 divisors (see below), whose sum is σ = 77457100. Its totient is φ = 76783104.

The previous prime is 77120083. The next prime is 77120137. The reversal of 77120101 is 10102177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57988225 + 19131876 = 7615^2 + 4374^2 .

It is a cyclic number.

It is not a de Polignac number, because 77120101 - 2⁹ = 77119589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77120171) 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 in 3 ways as a sum of consecutive naturals, for example, 168156 + ... + 168613.

It is an arithmetic number, because the mean of its divisors is an integer number (19364275).

Almost surely, 2^77120101 is an apocalyptic number.

It is an amenable number.

77120101 is a deficient number, since it is larger than the sum of its proper divisors (336999).

77120101 is a wasteful number, since it uses less digits than its factorization.

77120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336998.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 77120101 is about 8781.8051105681. The cubic root of 77120101 is about 425.6531613033.

Adding to 77120101 its reverse (10102177), we get a palindrome (87222278).

The spelling of 77120101 in words is "seventy-seven million, one hundred twenty thousand, one hundred one".