2691023 has 6 divisors (see below), whose sum is σ = 2813664. Its totient is φ = 2573516.

The previous prime is 2691019. The next prime is 2691037. The reversal of 2691023 is 3201962.

It is not a de Polignac number, because 2691023 - 2² = 2691019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2691023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2015 + ... + 3072.

It is an arithmetic number, because the mean of its divisors is an integer number (468944).

2^2691023 is an apocalyptic number.

2691023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2691023 is a deficient number, since it is larger than the sum of its proper divisors (122641).

2691023 is an equidigital number, since it uses as much as digits as its factorization.

2691023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2691023 is about 1640.4337840949. The cubic root of 2691023 is about 139.0931694254.

Adding to 2691023 its reverse (3201962), we get a palindrome (5892985).

The spelling of 2691023 in words is "two million, six hundred ninety-one thousand, twenty-three".