2811997 has 4 divisors (see below), whose sum is σ = 2825536. Its totient is φ = 2798460.

The previous prime is 2811989. The next prime is 2812001. The reversal of 2811997 is 7991182.

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 2811997 - 2³ = 2811989 is a prime.

It is a Duffinian number.

2811997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2811947) 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, 6453 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (706384).

2^2811997 is an apocalyptic number.

It is an amenable number.

2811997 is a deficient number, since it is larger than the sum of its proper divisors (13539).

2811997 is a wasteful number, since it uses less digits than its factorization.

2811997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13538.

The product of its digits is 9072, while the sum is 37.

The square root of 2811997 is about 1676.9010107934. The cubic root of 2811997 is about 141.1469888772.

It can be divided in two parts, 281 and 1997, that added together give a triangular number (2278 = T₆₇).

The spelling of 2811997 in words is "two million, eight hundred eleven thousand, nine hundred ninety-seven".