5561641 has 2 divisors, whose sum is σ = 5561642. Its totient is φ = 5561640.

The previous prime is 5561639. The next prime is 5561657. The reversal of 5561641 is 1461655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3861225 + 1700416 = 1965^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561641 - 2¹ = 5561639 is a prime.

It is a super-2 number, since 2×5561641² = 61863701225762, which contains 22 as substring.

Together with 5561639, it forms a pair of twin primes.

It is equal to p₃₈₄₇₂₄ and since 5561641 and 384724 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (5561041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2780820 + 2780821.

It is an arithmetic number, because the mean of its divisors is an integer number (2780821).

Almost surely, 2^5561641 is an apocalyptic number.

It is an amenable number.

5561641 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561641 is an equidigital number, since it uses as much as digits as its factorization.

5561641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 5561641 is about 2358.3131683472. The cubic root of 5561641 is about 177.1744054298.

It can be divided in two parts, 556 and 1641, that added together give a cube (2197 = 13³).

The spelling of 5561641 in words is "five million, five hundred sixty-one thousand, six hundred forty-one".