2639491 has 2 divisors, whose sum is σ = 2639492. Its totient is φ = 2639490.

The previous prime is 2639489. The next prime is 2639501. The reversal of 2639491 is 1949362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2639491 - 2¹ = 2639489 is a prime.

Together with 2639489, it forms a pair of twin primes.

2639491 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2639401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319745 + 1319746.

It is an arithmetic number, because the mean of its divisors is an integer number (1319746).

2^2639491 is an apocalyptic number.

2639491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639491 is an equidigital number, since it uses as much as digits as its factorization.

2639491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 2639491 is about 1624.6510394543. The cubic root of 2639491 is about 138.1995816924.

The spelling of 2639491 in words is "two million, six hundred thirty-nine thousand, four hundred ninety-one".