2623991 has 2 divisors, whose sum is σ = 2623992. Its totient is φ = 2623990.

The previous prime is 2623979. The next prime is 2623993. The reversal of 2623991 is 1993262.

2623991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2623991 is a prime.

Together with 2623993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2623993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1311995 + 1311996.

It is an arithmetic number, because the mean of its divisors is an integer number (1311996).

2^2623991 is an apocalyptic number.

2623991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2623991 is an equidigital number, since it uses as much as digits as its factorization.

2623991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 2623991 is about 1619.8737605135. The cubic root of 2623991 is about 137.9285319223.

The spelling of 2623991 in words is "two million, six hundred twenty-three thousand, nine hundred ninety-one".