5661121 has 2 divisors, whose sum is σ = 5661122. Its totient is φ = 5661120.

The previous prime is 5661113. The next prime is 5661143. The reversal of 5661121 is 1211665.

It is an a-pointer prime, because the next prime (5661143) can be obtained adding 5661121 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3101121 + 2560000 = 1761^2 + 1600^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661121 - 2³ = 5661113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5661092 and 5661101.

It is not a weakly prime, because it can be changed into another prime (5661191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830560 + 2830561.

It is an arithmetic number, because the mean of its divisors is an integer number (2830561).

Almost surely, 2^5661121 is an apocalyptic number.

It is an amenable number.

5661121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661121 is an equidigital number, since it uses as much as digits as its factorization.

5661121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 5661121 is about 2379.3110347325. The cubic root of 5661121 is about 178.2245304428.

Adding to 5661121 its reverse (1211665), we get a palindrome (6872786).

The spelling of 5661121 in words is "five million, six hundred sixty-one thousand, one hundred twenty-one".