2621631 has 4 divisors (see below), whose sum is σ = 3495512. Its totient is φ = 1747752.

The previous prime is 2621617. The next prime is 2621669. The reversal of 2621631 is 1361262.

It is a happy number.

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

It is not a de Polignac number, because 2621631 - 2⁹ = 2621119 is a prime.

It is a super-2 number, since 2×2621631² = 13745898200322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2621598 and 2621607.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436936 + ... + 436941.

It is an arithmetic number, because the mean of its divisors is an integer number (873878).

2^2621631 is an apocalyptic number.

2621631 is a deficient number, since it is larger than the sum of its proper divisors (873881).

2621631 is an equidigital number, since it uses as much as digits as its factorization.

2621631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873880.

The product of its digits is 432, while the sum is 21.

The square root of 2621631 is about 1619.1451448218. The cubic root of 2621631 is about 137.8871688521.

Adding to 2621631 its reverse (1361262), we get a palindrome (3982893).

The spelling of 2621631 in words is "two million, six hundred twenty-one thousand, six hundred thirty-one".