2670991 has 4 divisors (see below), whose sum is σ = 2757184. Its totient is φ = 2584800.

The previous prime is 2670973. The next prime is 2671021. The reversal of 2670991 is 1990762.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990762 = 2 ⋅995381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2670991 is a prime.

It is a Duffinian number.

2670991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2670931) 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, 43050 + ... + 43111.

It is an arithmetic number, because the mean of its divisors is an integer number (689296).

2^2670991 is an apocalyptic number.

2670991 is a deficient number, since it is larger than the sum of its proper divisors (86193).

2670991 is an equidigital number, since it uses as much as digits as its factorization.

2670991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86192.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 2670991 is about 1634.3166767796. The cubic root of 2670991 is about 138.7471725204.

It can be divided in two parts, 26 and 70991, that added together give a palindrome (71017).

The spelling of 2670991 in words is "two million, six hundred seventy thousand, nine hundred ninety-one".