9791977 has 4 divisors (see below), whose sum is σ = 10545220. Its totient is φ = 9038736.

The previous prime is 9791959. The next prime is 9791981. The reversal of 9791977 is 7791979.

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: 7791979 = 13 ⋅599383.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 5216656 = 2139^2 + 2284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9791977 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 9791977.

It is not an unprimeable number, because it can be changed into a prime (9791777) 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, 376602 + ... + 376627.

It is an arithmetic number, because the mean of its divisors is an integer number (2636305).

Almost surely, 2^9791977 is an apocalyptic number.

It is an amenable number.

9791977 is a deficient number, since it is larger than the sum of its proper divisors (753243).

9791977 is a wasteful number, since it uses less digits than its factorization.

9791977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753242.

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

The square root of 9791977 is about 3129.2134794545. The cubic root of 9791977 is about 213.9390821453.

The spelling of 9791977 in words is "nine million, seven hundred ninety-one thousand, nine hundred seventy-seven".