2615661 has 12 divisors (see below), whose sum is σ = 3803488. Its totient is φ = 1732104.

The previous prime is 2615659. The next prime is 2615681. The reversal of 2615661 is 1665162.

It is a happy number.

It is not a de Polignac number, because 2615661 - 2¹ = 2615659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2615651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576 + ... + 2358.

2^2615661 is an apocalyptic number.

It is an amenable number.

2615661 is a deficient number, since it is larger than the sum of its proper divisors (1187827).

2615661 is a wasteful number, since it uses less digits than its factorization.

2615661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952 (or 1949 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 2615661 is about 1617.3005286588. The cubic root of 2615661 is about 137.7824233653.

The spelling of 2615661 in words is "two million, six hundred fifteen thousand, six hundred sixty-one".