2131705 has 12 divisors (see below), whose sum is σ = 2702052. Its totient is φ = 1614240.

The previous prime is 2131699. The next prime is 2131721. The reversal of 2131705 is 5071312.

It can be written as a sum of positive squares in 2 ways, for example, as 1432809 + 698896 = 1197^2 + 836^2 .

It is not a de Polignac number, because 2131705 - 2⁹ = 2131193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

2131705 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1215 + ... + 2395.

It is an arithmetic number, because the mean of its divisors is an integer number (225171).

2^2131705 is an apocalyptic number.

It is an amenable number.

2131705 is a deficient number, since it is larger than the sum of its proper divisors (570347).

2131705 is a wasteful number, since it uses less digits than its factorization.

2131705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1205 counting only the distinct ones).

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

The square root of 2131705 is about 1460.0359584613. The cubic root of 2131705 is about 128.6991567242.

The spelling of 2131705 in words is "two million, one hundred thirty-one thousand, seven hundred five".