2981623 has 4 divisors (see below), whose sum is σ = 2987848. Its totient is φ = 2975400.

The previous prime is 2981597. The next prime is 2981653. The reversal of 2981623 is 3261892.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2981623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2981653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2328 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (746962).

2^2981623 is an apocalyptic number.

2981623 is a deficient number, since it is larger than the sum of its proper divisors (6225).

2981623 is an equidigital number, since it uses as much as digits as its factorization.

2981623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224.

The product of its digits is 5184, while the sum is 31.

The square root of 2981623 is about 1726.7376755026. The cubic root of 2981623 is about 143.9298623201.

The spelling of 2981623 in words is "two million, nine hundred eighty-one thousand, six hundred twenty-three".