2189631 has 4 divisors (see below), whose sum is σ = 2919512. Its totient is φ = 1459752.

The previous prime is 2189609. The next prime is 2189633. The reversal of 2189631 is 1369812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2189631 - 2⁵ = 2189599 is a prime.

It is a super-2 number, since 2×2189631² = 9588967832322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364936 + ... + 364941.

It is an arithmetic number, because the mean of its divisors is an integer number (729878).

2^2189631 is an apocalyptic number.

2189631 is a deficient number, since it is larger than the sum of its proper divisors (729881).

2189631 is an equidigital number, since it uses as much as digits as its factorization.

2189631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729880.

The product of its digits is 2592, while the sum is 30.

The square root of 2189631 is about 1479.7401798965. The cubic root of 2189631 is about 129.8544920272.

The spelling of 2189631 in words is "two million, one hundred eighty-nine thousand, six hundred thirty-one".