5631601 has 2 divisors, whose sum is σ = 5631602. Its totient is φ = 5631600.

The previous prime is 5631599. The next prime is 5631623. The reversal of 5631601 is 1061365.

It is an a-pointer prime, because the next prime (5631623) can be obtained adding 5631601 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., 5569600 + 62001 = 2360^2 + 249^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631601 - 2¹ = 5631599 is a prime.

Together with 5631599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5631671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815800 + 2815801.

It is an arithmetic number, because the mean of its divisors is an integer number (2815801).

Almost surely, 2^5631601 is an apocalyptic number.

It is an amenable number.

5631601 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631601 is an equidigital number, since it uses as much as digits as its factorization.

5631601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 5631601 is about 2373.0994500863. The cubic root of 5631601 is about 177.9142055930.

Adding to 5631601 its reverse (1061365), we get a palindrome (6692966).

The spelling of 5631601 in words is "five million, six hundred thirty-one thousand, six hundred one".