6981091 has 4 divisors (see below), whose sum is σ = 7518112. Its totient is φ = 6444072.

The previous prime is 6981059. The next prime is 6981103. The reversal of 6981091 is 1901896.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6981091 - 2⁵ = 6981059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6981011) 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, 268491 + ... + 268516.

It is an arithmetic number, because the mean of its divisors is an integer number (1879528).

Almost surely, 2^6981091 is an apocalyptic number.

6981091 is a deficient number, since it is larger than the sum of its proper divisors (537021).

6981091 is a wasteful number, since it uses less digits than its factorization.

6981091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537020.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 6981091 is about 2642.1754294520. The cubic root of 6981091 is about 191.1207171598.

The spelling of 6981091 in words is "six million, nine hundred eighty-one thousand, ninety-one".