2251631 has 8 divisors (see below), whose sum is σ = 2365440. Its totient is φ = 2139192.

The previous prime is 2251603. The next prime is 2251637. The reversal of 2251631 is 1361522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251631 is a prime.

It is a super-2 number, since 2×2251631² = 10139684320322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251637) 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 in 7 ways as a sum of consecutive naturals, for example, 4910 + ... + 5348.

It is an arithmetic number, because the mean of its divisors is an integer number (295680).

2^2251631 is an apocalyptic number.

2251631 is a deficient number, since it is larger than the sum of its proper divisors (113809).

2251631 is a wasteful number, since it uses less digits than its factorization.

2251631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 360, while the sum is 20.

The square root of 2251631 is about 1500.5435681779. The cubic root of 2251631 is about 131.0687245016.

It can be divided in two parts, 2251 and 631, that added together give a palindrome (2882).

The spelling of 2251631 in words is "two million, two hundred fifty-one thousand, six hundred thirty-one".