2479991 has 2 divisors, whose sum is σ = 2479992. Its totient is φ = 2479990.

The previous prime is 2479987. The next prime is 2480003. The reversal of 2479991 is 1999742.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2479991 - 2² = 2479987 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2479901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239995 + 1239996.

It is an arithmetic number, because the mean of its divisors is an integer number (1239996).

2^2479991 is an apocalyptic number.

2479991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2479991 is an equidigital number, since it uses as much as digits as its factorization.

2479991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 2479991 is about 1574.7987172969. The cubic root of 2479991 is about 135.3578253024.

Subtracting from 2479991 its reverse (1999742), we obtain a square (480249 = 693²).

The spelling of 2479991 in words is "two million, four hundred seventy-nine thousand, nine hundred ninety-one".