2661993 has 6 divisors (see below), whose sum is σ = 3845114. Its totient is φ = 1774656.

The previous prime is 2661991. The next prime is 2662027. The reversal of 2661993 is 3991662.

2661993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2442969 + 219024 = 1563^2 + 468^2 .

It is not a de Polignac number, because 2661993 - 2¹ = 2661991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661991) 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 in 5 ways as a sum of consecutive naturals, for example, 147880 + ... + 147897.

2^2661993 is an apocalyptic number.

It is an amenable number.

2661993 is a deficient number, since it is larger than the sum of its proper divisors (1183121).

2661993 is a wasteful number, since it uses less digits than its factorization.

2661993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295783 (or 295780 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 2661993 is about 1631.5615219783. The cubic root of 2661993 is about 138.5911940083.

The spelling of 2661993 in words is "two million, six hundred sixty-one thousand, nine hundred ninety-three".