77345121 has 16 divisors (see below), whose sum is σ = 124792704. Its totient is φ = 41597184.

The previous prime is 77345111. The next prime is 77345123. The reversal of 77345121 is 12154377.

77345121 = 2125² + 2126² + ... + 2141².

It is not a de Polignac number, because 77345121 - 2¹³ = 77336929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77345123) 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 15 ways as a sum of consecutive naturals, for example, 107970 + ... + 108683.

It is an arithmetic number, because the mean of its divisors is an integer number (7799544).

Almost surely, 2^77345121 is an apocalyptic number.

It is an amenable number.

77345121 is a deficient number, since it is larger than the sum of its proper divisors (47447583).

77345121 is a wasteful number, since it uses less digits than its factorization.

77345121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216680.

The product of its digits is 5880, while the sum is 30.

The square root of 77345121 is about 8794.6074955054. The cubic root of 77345121 is about 426.0667476799.

Adding to 77345121 its reverse (12154377), we get a palindrome (89499498).

The spelling of 77345121 in words is "seventy-seven million, three hundred forty-five thousand, one hundred twenty-one".