77090121 has 12 divisors (see below), whose sum is σ = 117902772. Its totient is φ = 48370176.

The previous prime is 77090119. The next prime is 77090137. The reversal of 77090121 is 12109077.

77090121 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 29975625 + 47114496 = 5475^2 + 6864^2 .

It is not a de Polignac number, because 77090121 - 2¹ = 77090119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77090161) 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 11 ways as a sum of consecutive naturals, for example, 251776 + ... + 252081.

It is an arithmetic number, because the mean of its divisors is an integer number (9825231).

Almost surely, 2^77090121 is an apocalyptic number.

It is an amenable number.

77090121 is a deficient number, since it is larger than the sum of its proper divisors (40812651).

77090121 is a wasteful number, since it uses less digits than its factorization.

77090121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503880 (or 503877 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 77090121 is about 8780.0980062867. The cubic root of 77090121 is about 425.5979974072.

Adding to 77090121 its reverse (12109077), we get a palindrome (89199198).

The spelling of 77090121 in words is "seventy-seven million, ninety thousand, one hundred twenty-one".