2513621 has 4 divisors (see below), whose sum is σ = 2742144. Its totient is φ = 2285100.

The previous prime is 2513617. The next prime is 2513653. The reversal of 2513621 is 1263152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2513621 - 2² = 2513617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2513593 and 2513602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515621) 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, 114245 + ... + 114266.

It is an arithmetic number, because the mean of its divisors is an integer number (685536).

2^2513621 is an apocalyptic number.

It is an amenable number.

2513621 is a deficient number, since it is larger than the sum of its proper divisors (228523).

2513621 is a wasteful number, since it uses less digits than its factorization.

2513621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228522.

The product of its digits is 360, while the sum is 20.

The square root of 2513621 is about 1585.4403173882. The cubic root of 2513621 is about 135.9669217419.

Adding to 2513621 its reverse (1263152), we get a palindrome (3776773).

The spelling of 2513621 in words is "two million, five hundred thirteen thousand, six hundred twenty-one".