2500621 has 2 divisors, whose sum is σ = 2500622. Its totient is φ = 2500620.

The previous prime is 2500601. The next prime is 2500637. The reversal of 2500621 is 1260052.

It is a happy number.

It is an a-pointer prime, because the next prime (2500637) can be obtained adding 2500621 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2464900 + 35721 = 1570^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500621 - 2⁹ = 2500109 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2500595 and 2500604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2500601) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250310 + 1250311.

It is an arithmetic number, because the mean of its divisors is an integer number (1250311).

2^2500621 is an apocalyptic number.

It is an amenable number.

2500621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500621 is an equidigital number, since it uses as much as digits as its factorization.

2500621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2500621 is about 1581.3351953334. The cubic root of 2500621 is about 135.7321175883.

Adding to 2500621 its reverse (1260052), we get a palindrome (3760673).

The spelling of 2500621 in words is "two million, five hundred thousand, six hundred twenty-one".