9381644977 has 4 divisors (see below), whose sum is σ = 9386908480. Its totient is φ = 9376381476.

The previous prime is 9381644947. The next prime is 9381645019. The reversal of 9381644977 is 7794461839.

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: 7794461839 = 9437 ⋅825947.

It is a cyclic number.

It is not a de Polignac number, because 9381644977 - 2⁷ = 9381644849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9381644947) 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, 2629077 + ... + 2632642.

It is an arithmetic number, because the mean of its divisors is an integer number (2346727120).

Almost surely, 2^9381644977 is an apocalyptic number.

It is an amenable number.

9381644977 is a deficient number, since it is larger than the sum of its proper divisors (5263503).

9381644977 is a wasteful number, since it uses less digits than its factorization.

9381644977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263502.

The product of its digits is 9144576, while the sum is 58.

The square root of 9381644977 is about 96858.8920905045. The cubic root of 9381644977 is about 2109.0797314330.

The spelling of 9381644977 in words is "nine billion, three hundred eighty-one million, six hundred forty-four thousand, nine hundred seventy-seven".