2261631 has 8 divisors (see below), whose sum is σ = 3032064.
Its totient is φ = 1499480.
The previous prime is 2261621. The next prime is 2261639. The reversal of 2261631 is 1361622.
It is a happy number.
2261631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 2261631 - 25 = 2261599 is a prime.
It is a super-2 number, since 2×22616312 = 10229949560322, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 2261598 and 2261607.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2261639) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1401 + ... + 2546.
It is an arithmetic number, because the mean of its divisors is an integer number (379008).
22261631 is an apocalyptic number.
2261631 is a deficient number, since it is larger than the sum of its proper divisors (770433).
2261631 is a wasteful number, since it uses less digits than its factorization.
2261631 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4141.
The product of its digits is 432, while the sum is 21.
The square root of 2261631 is about 1503.8720025321.
The cubic root of 2261631 is about 131.2624731910.
Subtracting from 2261631 its reverse (1361622), we obtain a palindrome (900009).
The spelling of 2261631 in words is "two million, two hundred sixty-one thousand, six hundred thirty-one".