2105731 has 2 divisors, whose sum is σ = 2105732. Its totient is φ = 2105730.

The previous prime is 2105729. The next prime is 2105759. The reversal of 2105731 is 1375012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105731 - 2¹ = 2105729 is a prime.

It is a super-2 number, since 2×2105731² = 8868206088722, which contains 22 as substring.

Together with 2105729, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹⁵ + 1 + 0 + 5⁹ + 7⁶ + 3⁷ + 1 .

It is a junction number, because it is equal to n+sod(n) for n = 2105699 and 2105708.

It is not a weakly prime, because it can be changed into another prime (2105231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052865 + 1052866.

It is an arithmetic number, because the mean of its divisors is an integer number (1052866).

2^2105731 is an apocalyptic number.

2105731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105731 is an equidigital number, since it uses as much as digits as its factorization.

2105731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 2105731 is about 1451.1137102240. The cubic root of 2105731 is about 128.1743027390.

The spelling of 2105731 in words is "two million, one hundred five thousand, seven hundred thirty-one".