5091778 has 4 divisors (see below), whose sum is σ = 7637670. Its totient is φ = 2545888.

The previous prime is 5091769. The next prime is 5091797. The reversal of 5091778 is 8771905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8771905 = 5 ⋅1754381.

It can be written as a sum of positive squares in only one way, i.e., 3179089 + 1912689 = 1783^2 + 1383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272943 + ... + 1272946.

Almost surely, 2^5091778 is an apocalyptic number.

5091778 is a deficient number, since it is larger than the sum of its proper divisors (2545892).

5091778 is a wasteful number, since it uses less digits than its factorization.

5091778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545891.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 5091778 is about 2256.4968424529. The cubic root of 5091778 is about 172.0375120995.

The spelling of 5091778 in words is "five million, ninety-one thousand, seven hundred seventy-eight".