6691138 has 8 divisors (see below), whose sum is σ = 10130832. Its totient is φ = 3314196.

The previous prime is 6691129. The next prime is 6691147. The reversal of 6691138 is 8311966.

It is an interprime number because it is at equal distance from previous prime (6691129) and next prime (6691147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15420 + ... + 15847.

It is an arithmetic number, because the mean of its divisors is an integer number (1266354).

Almost surely, 2^6691138 is an apocalyptic number.

6691138 is a deficient number, since it is larger than the sum of its proper divisors (3439694).

6691138 is a wasteful number, since it uses less digits than its factorization.

6691138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31376.

The product of its digits is 7776, while the sum is 34.

The square root of 6691138 is about 2586.7234100305. The cubic root of 6691138 is about 188.4372086449.

It can be divided in two parts, 66 and 91138, that added together give a square (91204 = 302²).

The spelling of 6691138 in words is "six million, six hundred ninety-one thousand, one hundred thirty-eight".