3581631 has 16 divisors (see below), whose sum is σ = 5359200. Its totient is φ = 2363904.

The previous prime is 3581621. The next prime is 3581639. The reversal of 3581631 is 1361853.

It is not a de Polignac number, because 3581631 - 2⁷ = 3581503 is a prime.

It is a super-2 number, since 2×3581631² = 25656161240322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3581595 and 3581604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335 + ... + 3551.

It is an arithmetic number, because the mean of its divisors is an integer number (334950).

Almost surely, 2^3581631 is an apocalyptic number.

3581631 is a deficient number, since it is larger than the sum of its proper divisors (1777569).

3581631 is a wasteful number, since it uses less digits than its factorization.

3581631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1329 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 3581631 is about 1892.5197489062. The cubic root of 3581631 is about 153.0007689312. Note that the first 3 decimals are identical.

The spelling of 3581631 in words is "three million, five hundred eighty-one thousand, six hundred thirty-one".