2691997 has 8 divisors (see below), whose sum is σ = 3356352. Its totient is φ = 2097600.

The previous prime is 2691979. The next prime is 2692003. The reversal of 2691997 is 7991962.

2691997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2691997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17404 + ... + 17557.

It is an arithmetic number, because the mean of its divisors is an integer number (419544).

2^2691997 is an apocalyptic number.

It is an amenable number.

2691997 is a deficient number, since it is larger than the sum of its proper divisors (664355).

2691997 is a wasteful number, since it uses less digits than its factorization.

2691997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34979.

The product of its digits is 61236, while the sum is 43.

The square root of 2691997 is about 1640.7306299329. The cubic root of 2691997 is about 139.1099487203.

The spelling of 2691997 in words is "two million, six hundred ninety-one thousand, nine hundred ninety-seven".