2611621 has 2 divisors, whose sum is σ = 2611622. Its totient is φ = 2611620.

The previous prime is 2611613. The next prime is 2611633. The reversal of 2611621 is 1261162.

2611621 = T₁₃₁₈ + T₁₃₁₉ + T₁₃₂₀.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 83521 = 1590^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2611621 - 2³ = 2611613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2611321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305810 + 1305811.

It is an arithmetic number, because the mean of its divisors is an integer number (1305811).

2^2611621 is an apocalyptic number.

2611621 is the 1320-th centered triangular number.

It is an amenable number.

2611621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611621 is an equidigital number, since it uses as much as digits as its factorization.

2611621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 2611621 is about 1616.0510511738. The cubic root of 2611621 is about 137.7114498687.

Adding to 2611621 its reverse (1261162), we get a palindrome (3872783).

The spelling of 2611621 in words is "two million, six hundred eleven thousand, six hundred twenty-one".