5611945 has 4 divisors (see below), whose sum is σ = 6734340. Its totient is φ = 4489552.

The previous prime is 5611937. The next prime is 5611951. The reversal of 5611945 is 5491165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5491165 = 5 ⋅1098233.

It can be written as a sum of positive squares in 2 ways, for example, as 4247721 + 1364224 = 2061^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 5611945 - 2³ = 5611937 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 561190 + ... + 561199.

It is an arithmetic number, because the mean of its divisors is an integer number (1683585).

Almost surely, 2^5611945 is an apocalyptic number.

It is an amenable number.

5611945 is a deficient number, since it is larger than the sum of its proper divisors (1122395).

5611945 is a wasteful number, since it uses less digits than its factorization.

5611945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122394.

The product of its digits is 5400, while the sum is 31.

The square root of 5611945 is about 2368.9544107053. The cubic root of 5611945 is about 177.7069727440.

It can be divided in two parts, 5611 and 945, that added together give a palindrome (6556).

The spelling of 5611945 in words is "five million, six hundred eleven thousand, nine hundred forty-five".