6091978 has 4 divisors (see below), whose sum is σ = 9137970. Its totient is φ = 3045988.

The previous prime is 6091973. The next prime is 6091991. The reversal of 6091978 is 8791906.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8791906 = 2 ⋅4395953.

It can be written as a sum of positive squares in only one way, i.e., 4853209 + 1238769 = 2203^2 + 1113^2 .

It is a super-2 number, since 2×6091978² = 74224391904968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6091978.

It is not an unprimeable number, because it can be changed into a prime (6091973) 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 as a sum of consecutive naturals, namely, 1522993 + ... + 1522996.

Almost surely, 2^6091978 is an apocalyptic number.

6091978 is a deficient number, since it is larger than the sum of its proper divisors (3045992).

6091978 is a wasteful number, since it uses less digits than its factorization.

6091978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045991.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 6091978 is about 2468.1932663388. The cubic root of 6091978 is about 182.6358830384.

The spelling of 6091978 in words is "six million, ninety-one thousand, nine hundred seventy-eight".