5661851 has 16 divisors (see below), whose sum is σ = 6384000. Its totient is φ = 4987008.

The previous prime is 5661839. The next prime is 5661893. The reversal of 5661851 is 1581665.

It is a happy number.

It is not a de Polignac number, because 5661851 - 2¹⁸ = 5399707 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 (5661811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37925 + ... + 38073.

It is an arithmetic number, because the mean of its divisors is an integer number (399000).

Almost surely, 2^5661851 is an apocalyptic number.

5661851 is a deficient number, since it is larger than the sum of its proper divisors (722149).

5661851 is a wasteful number, since it uses less digits than its factorization.

5661851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278.

The product of its digits is 7200, while the sum is 32.

The square root of 5661851 is about 2379.4644355401. The cubic root of 5661851 is about 178.2321907816.

The spelling of 5661851 in words is "five million, six hundred sixty-one thousand, eight hundred fifty-one".