3561631 has 2 divisors, whose sum is σ = 3561632. Its totient is φ = 3561630.

The previous prime is 3561611. The next prime is 3561641. The reversal of 3561631 is 1361653.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3561631 - 2¹⁹ = 3037343 is a prime.

It is a super-2 number, since 2×3561631² = 25370430760322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3561596 and 3561605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3561611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780815 + 1780816.

It is an arithmetic number, because the mean of its divisors is an integer number (1780816).

Almost surely, 2^3561631 is an apocalyptic number.

3561631 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561631 is an equidigital number, since it uses as much as digits as its factorization.

3561631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 25.

The square root of 3561631 is about 1887.2283910539. The cubic root of 3561631 is about 152.7154493033.

The spelling of 3561631 in words is "three million, five hundred sixty-one thousand, six hundred thirty-one".