3125621 has 4 divisors (see below), whose sum is σ = 3139500. Its totient is φ = 3111744.

The previous prime is 3125611. The next prime is 3125651. The reversal of 3125621 is 1265213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1265213 = 971 ⋅1303.

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 1464100 = 1289^2 + 1210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3125621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3125593 and 3125602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3125611) 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, 6596 + ... + 7053.

It is an arithmetic number, because the mean of its divisors is an integer number (784875).

Almost surely, 2^3125621 is an apocalyptic number.

It is an amenable number.

3125621 is a deficient number, since it is larger than the sum of its proper divisors (13879).

3125621 is a wasteful number, since it uses less digits than its factorization.

3125621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13878.

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

The square root of 3125621 is about 1767.9425895656. The cubic root of 3125621 is about 146.2105706160.

It can be divided in two parts, 31 and 25621, that added together give a palindrome (25652).

The spelling of 3125621 in words is "three million, one hundred twenty-five thousand, six hundred twenty-one".