2631621 has 8 divisors (see below), whose sum is σ = 3622144. Its totient is φ = 1697760.

The previous prime is 2631581. The next prime is 2631631. The reversal of 2631621 is 1261362.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2631621 - 2⁷ = 2631493 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 6³ + 3⁷ + 1 + 6⁵ + 2²¹ + 1 .

It is a Duffinian number.

2631621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14056 + ... + 14241.

It is an arithmetic number, because the mean of its divisors is an integer number (452768).

2^2631621 is an apocalyptic number.

It is an amenable number.

2631621 is a deficient number, since it is larger than the sum of its proper divisors (990523).

2631621 is a wasteful number, since it uses less digits than its factorization.

2631621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28331.

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

The square root of 2631621 is about 1622.2271727474. The cubic root of 2631621 is about 138.0620913613.

Adding to 2631621 its reverse (1261362), we get a palindrome (3892983).

The spelling of 2631621 in words is "two million, six hundred thirty-one thousand, six hundred twenty-one".