2621261 has 4 divisors (see below), whose sum is σ = 2644572. Its totient is φ = 2597952.

The previous prime is 2621257. The next prime is 2621263. The reversal of 2621261 is 1621262.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42025 + 2579236 = 205^2 + 1606^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621261 - 2² = 2621257 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 (2621263) 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, 11486 + ... + 11711.

It is an arithmetic number, because the mean of its divisors is an integer number (661143).

2^2621261 is an apocalyptic number.

It is an amenable number.

2621261 is a deficient number, since it is larger than the sum of its proper divisors (23311).

2621261 is a wasteful number, since it uses less digits than its factorization.

2621261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310.

The product of its digits is 288, while the sum is 20.

The square root of 2621261 is about 1619.0308829667. The cubic root of 2621261 is about 137.8806817132.

Subtracting from 2621261 its reverse (1621262), we obtain a palindrome (999999).

It can be divided in two parts, 2621 and 261, that added together give a palindrome (2882).

The spelling of 2621261 in words is "two million, six hundred twenty-one thousand, two hundred sixty-one".