921984077 has 4 divisors (see below), whose sum is σ = 1053696096. Its totient is φ = 790272060.

The previous prime is 921984053. The next prime is 921984083. The reversal of 921984077 is 770489129.

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: 770489129 = 4793 ⋅160753.

It is a cyclic number.

It is not a de Polignac number, because 921984077 - 2¹⁰ = 921983053 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 (921984677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65855999 + ... + 65856012.

It is an arithmetic number, because the mean of its divisors is an integer number (263424024).

Almost surely, 2^921984077 is an apocalyptic number.

It is an amenable number.

921984077 is a deficient number, since it is larger than the sum of its proper divisors (131712019).

921984077 is a wasteful number, since it uses less digits than its factorization.

921984077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131712018.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 921984077 is about 30364.1907022071. The cubic root of 921984077 is about 973.2874876631.

The spelling of 921984077 in words is "nine hundred twenty-one million, nine hundred eighty-four thousand, seventy-seven".