77945111 has 4 divisors (see below), whose sum is σ = 79757832. Its totient is φ = 76132392.

The previous prime is 77945089. The next prime is 77945159. The reversal of 77945111 is 11154977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11154977 = 23 ⋅484999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77945111 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 (77915111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906296 + ... + 906381.

It is an arithmetic number, because the mean of its divisors is an integer number (19939458).

Almost surely, 2^77945111 is an apocalyptic number.

77945111 is a deficient number, since it is larger than the sum of its proper divisors (1812721).

77945111 is a wasteful number, since it uses less digits than its factorization.

77945111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812720.

The product of its digits is 8820, while the sum is 35.

The square root of 77945111 is about 8828.6528417421. The cubic root of 77945111 is about 427.1656215906.

The spelling of 77945111 in words is "seventy-seven million, nine hundred forty-five thousand, one hundred eleven".