5601781 has 2 divisors, whose sum is σ = 5601782. Its totient is φ = 5601780.

The previous prime is 5601779. The next prime is 5601787. The reversal of 5601781 is 1871065.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 695556 = 2215^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 5601781 - 2¹ = 5601779 is a prime.

It is a super-2 number, since 2×5601781² = 62759900743922, which contains 22 as substring.

Together with 5601779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5601787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2800890 + 2800891.

It is an arithmetic number, because the mean of its divisors is an integer number (2800891).

Almost surely, 2^5601781 is an apocalyptic number.

It is an amenable number.

5601781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5601781 is an equidigital number, since it uses as much as digits as its factorization.

5601781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 5601781 is about 2366.8081882569. The cubic root of 5601781 is about 177.5996240320.

The spelling of 5601781 in words is "five million, six hundred one thousand, seven hundred eighty-one".