5661012 has 48 divisors (see below), whose sum is σ = 15895040. Its totient is φ = 1531872.

The previous prime is 5661001. The next prime is 5661041. The reversal of 5661012 is 2101665.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 5661012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178 + ... + 3369.

Almost surely, 2^5661012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7947520).

5661012 is an abundant number, since it is smaller than the sum of its proper divisors (10234028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5661012 is a wasteful number, since it uses less digits than its factorization.

5661012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580 (or 3578 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 5661012 is about 2379.2881288318. The cubic root of 5661012 is about 178.2233865823.

Adding to 5661012 its reverse (2101665), we get a palindrome (7762677).

The spelling of 5661012 in words is "five million, six hundred sixty-one thousand, twelve".