2621651 has 4 divisors (see below), whose sum is σ = 2625000. Its totient is φ = 2618304.

The previous prime is 2621617. The next prime is 2621669. The reversal of 2621651 is 1561262.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1561262 = 2 ⋅780631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2621651 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 2298.

It is an arithmetic number, because the mean of its divisors is an integer number (656250).

2^2621651 is an apocalyptic number.

2621651 is a deficient number, since it is larger than the sum of its proper divisors (3349).

2621651 is a wasteful number, since it uses less digits than its factorization.

2621651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348.

The product of its digits is 720, while the sum is 23.

The square root of 2621651 is about 1619.1513209086. The cubic root of 2621651 is about 137.8875194908.

The spelling of 2621651 in words is "two million, six hundred twenty-one thousand, six hundred fifty-one".