5105621 has 4 divisors (see below), whose sum is σ = 5132544. Its totient is φ = 5078700.

The previous prime is 5105587. The next prime is 5105629. The reversal of 5105621 is 1265015.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1265015 = 5 ⋅253003.

It is a cyclic number.

It is not a de Polignac number, because 5105621 - 2¹⁴ = 5089237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5105593 and 5105602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105629) 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, 13175 + ... + 13556.

It is an arithmetic number, because the mean of its divisors is an integer number (1283136).

Almost surely, 2^5105621 is an apocalyptic number.

It is an amenable number.

5105621 is a deficient number, since it is larger than the sum of its proper divisors (26923).

5105621 is a wasteful number, since it uses less digits than its factorization.

5105621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26922.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 5105621 is about 2259.5621257226. The cubic root of 5105621 is about 172.1932769638.

Subtracting from 5105621 its reverse (1265015), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 5105621 in words is "five million, one hundred five thousand, six hundred twenty-one".