83923931477 has 4 divisors (see below), whose sum is σ = 83952784140. Its totient is φ = 83895078816.

The previous prime is 83923931473. The next prime is 83923931527. The reversal of 83923931477 is 77413932938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77413932938 = 2 ⋅38706966469.

It can be written as a sum of positive squares in 2 ways, for example, as 30962273521 + 52961657956 = 175961^2 + 230134^2 .

It is a cyclic number.

It is not a de Polignac number, because 83923931477 - 2² = 83923931473 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 (83923931473) 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, 14421968 + ... + 14427785.

It is an arithmetic number, because the mean of its divisors is an integer number (20988196035).

Almost surely, 2^83923931477 is an apocalyptic number.

It is an amenable number.

83923931477 is a deficient number, since it is larger than the sum of its proper divisors (28852663).

83923931477 is a wasteful number, since it uses less digits than its factorization.

83923931477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28852662.

The product of its digits is 6858432, while the sum is 56.

The spelling of 83923931477 in words is "eighty-three billion, nine hundred twenty-three million, nine hundred thirty-one thousand, four hundred seventy-seven".