77109997 has 4 divisors (see below), whose sum is σ = 77298940. Its totient is φ = 76921056.

The previous prime is 77109959. The next prime is 77110001. The reversal of 77109997 is 79990177.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79990177 = 97 ⋅824641.

It can be written as a sum of positive squares in 2 ways, for example, as 66683556 + 10426441 = 8166^2 + 3229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77109997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77109997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77109797) 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, 93858 + ... + 94675.

It is an arithmetic number, because the mean of its divisors is an integer number (19324735).

Almost surely, 2^77109997 is an apocalyptic number.

It is an amenable number.

77109997 is a deficient number, since it is larger than the sum of its proper divisors (188943).

77109997 is a wasteful number, since it uses less digits than its factorization.

77109997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188942.

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 77109997 is about 8781.2298113647. The cubic root of 77109997 is about 425.6345713062.

The spelling of 77109997 in words is "seventy-seven million, one hundred nine thousand, nine hundred ninety-seven".