2108631 has 8 divisors (see below), whose sum is σ = 3213184. Its totient is φ = 1204920.

The previous prime is 2108627. The next prime is 2108641. The reversal of 2108631 is 1368012.

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

It is not a de Polignac number, because 2108631 - 2² = 2108627 is a prime.

It is a super-2 number, since 2×2108631² = 8892649388322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 100411 = 2108631 / (2 + 1 + 0 + 8 + 6 + 3 + 1).

It is a Duffinian number.

2108631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2108598 and 2108607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50185 + ... + 50226.

It is an arithmetic number, because the mean of its divisors is an integer number (401648).

2^2108631 is an apocalyptic number.

2108631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2108631 is a deficient number, since it is larger than the sum of its proper divisors (1104553).

2108631 is a wasteful number, since it uses less digits than its factorization.

2108631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100421.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2108631 is about 1452.1125989399. The cubic root of 2108631 is about 128.2331160398.

The spelling of 2108631 in words is "two million, one hundred eight thousand, six hundred thirty-one".