2651623 has 4 divisors (see below), whose sum is σ = 2855608. Its totient is φ = 2447640.

The previous prime is 2651617. The next prime is 2651629. The reversal of 2651623 is 3261562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3261562 = 2 ⋅1630781.

It is an interprime number because it is at equal distance from previous prime (2651617) and next prime (2651629).

It is not a de Polignac number, because 2651623 - 2⁹ = 2651111 is a prime.

It is a super-2 number, since 2×2651623² = 14062209068258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101973 + ... + 101998.

It is an arithmetic number, because the mean of its divisors is an integer number (713902).

2^2651623 is an apocalyptic number.

2651623 is a deficient number, since it is larger than the sum of its proper divisors (203985).

2651623 is a wasteful number, since it uses less digits than its factorization.

2651623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203984.

The product of its digits is 2160, while the sum is 25.

The square root of 2651623 is about 1628.3804837936. The cubic root of 2651623 is about 138.4109955680.

The spelling of 2651623 in words is "two million, six hundred fifty-one thousand, six hundred twenty-three".