77109497 has 4 divisors (see below), whose sum is σ = 77360976. Its totient is φ = 76858020.

The previous prime is 77109457. The next prime is 77109499. The reversal of 77109497 is 79490177.

It is a happy number.

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: 79490177 = 13 ⋅6114629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77109497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77109499) 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, 125279 + ... + 125892.

It is an arithmetic number, because the mean of its divisors is an integer number (19340244).

Almost surely, 2^77109497 is an apocalyptic number.

It is an amenable number.

77109497 is a deficient number, since it is larger than the sum of its proper divisors (251479).

77109497 is a wasteful number, since it uses less digits than its factorization.

77109497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251478.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 77109497 is about 8781.2013415022. The cubic root of 77109497 is about 425.6336513314.

The spelling of 77109497 in words is "seventy-seven million, one hundred nine thousand, four hundred ninety-seven".