2615681 has 2 divisors, whose sum is σ = 2615682. Its totient is φ = 2615680.

The previous prime is 2615659. The next prime is 2615699. The reversal of 2615681 is 1865162.

It is a happy number.

2615681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2611456 + 4225 = 1616^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 2615681 - 2⁶ = 2615617 is a prime.

It is a super-2 number, since 2×2615681² = 13683574187522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2615651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1307840 + 1307841.

It is an arithmetic number, because the mean of its divisors is an integer number (1307841).

2^2615681 is an apocalyptic number.

It is an amenable number.

2615681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2615681 is an equidigital number, since it uses as much as digits as its factorization.

2615681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 2615681 is about 1617.3067117897. The cubic root of 2615681 is about 137.7827745374.

The spelling of 2615681 in words is "two million, six hundred fifteen thousand, six hundred eighty-one".