77545121 has 4 divisors (see below), whose sum is σ = 80916672. Its totient is φ = 74173572.

The previous prime is 77545093. The next prime is 77545123. The reversal of 77545121 is 12154577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12154577 = 139 ⋅87443.

It is a cyclic number.

It is not a de Polignac number, because 77545121 - 2¹⁰ = 77544097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77545123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1685741 + ... + 1685786.

It is an arithmetic number, because the mean of its divisors is an integer number (20229168).

Almost surely, 2^77545121 is an apocalyptic number.

It is an amenable number.

77545121 is a deficient number, since it is larger than the sum of its proper divisors (3371551).

77545121 is a wasteful number, since it uses less digits than its factorization.

77545121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371550.

The product of its digits is 9800, while the sum is 32.

The square root of 77545121 is about 8805.9707585251. The cubic root of 77545121 is about 426.4336745362.

Adding to 77545121 its reverse (12154577), we get a palindrome (89699698).

The spelling of 77545121 in words is "seventy-seven million, five hundred forty-five thousand, one hundred twenty-one".