6978181 has 4 divisors (see below), whose sum is σ = 7975072. Its totient is φ = 5981292.

The previous prime is 6978173. The next prime is 6978199. The reversal of 6978181 is 1818796.

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.

It is a cyclic number.

It is not a de Polignac number, because 6978181 - 2³ = 6978173 is a prime.

It is a super-2 number, since 2×6978181² = 97390020137522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978161) 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, 498435 + ... + 498448.

It is an arithmetic number, because the mean of its divisors is an integer number (1993768).

Almost surely, 2^6978181 is an apocalyptic number.

It is an amenable number.

6978181 is a deficient number, since it is larger than the sum of its proper divisors (996891).

6978181 is an equidigital number, since it uses as much as digits as its factorization.

6978181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996890.

The product of its digits is 24192, while the sum is 40.

The square root of 6978181 is about 2641.6246894667. The cubic root of 6978181 is about 191.0941578641.

The spelling of 6978181 in words is "six million, nine hundred seventy-eight thousand, one hundred eighty-one".