77555121 has 16 divisors (see below), whose sum is σ = 118627200. Its totient is φ = 44149248.

The previous prime is 77555041. The next prime is 77555161. The reversal of 77555121 is 12155577.

It is not a de Polignac number, because 77555121 - 2⁷ = 77554993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77555161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (7414200).

Almost surely, 2^77555121 is an apocalyptic number.

It is an amenable number.

77555121 is a deficient number, since it is larger than the sum of its proper divisors (41072079).

77555121 is a wasteful number, since it uses less digits than its factorization.

77555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14008.

The product of its digits is 12250, while the sum is 33.

The square root of 77555121 is about 8806.5385367919. The cubic root of 77555121 is about 426.4520043094.

The spelling of 77555121 in words is "seventy-seven million, five hundred fifty-five thousand, one hundred twenty-one".