2643491 has 2 divisors, whose sum is σ = 2643492. Its totient is φ = 2643490.

The previous prime is 2643479. The next prime is 2643497. The reversal of 2643491 is 1943462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2643491 - 2⁶ = 2643427 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁹ + 6 + 4³ + 3¹³ + 4¹⁰ + 9 + 1 .

It is not a weakly prime, because it can be changed into another prime (2643497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321745 + 1321746.

It is an arithmetic number, because the mean of its divisors is an integer number (1321746).

2^2643491 is an apocalyptic number.

2643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643491 is an equidigital number, since it uses as much as digits as its factorization.

2643491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 2643491 is about 1625.8816070059. The cubic root of 2643491 is about 138.2693576854.

Subtracting from 2643491 its sum of digits (29), we obtain a palindrome (2643462).

The spelling of 2643491 in words is "two million, six hundred forty-three thousand, four hundred ninety-one".