2143531 has 16 divisors (see below), whose sum is σ = 2467584. Its totient is φ = 1846944.

The previous prime is 2143517. The next prime is 2143541. The reversal of 2143531 is 1353412.

It is a cyclic number.

It is not a de Polignac number, because 2143531 - 2⁹ = 2143019 is a prime.

It is a super-2 number, since 2×2143531² = 9189450295922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁷ + 1 + 4⁴ + 3³ + 5⁹ + 3¹⁰ + 1 .

It is a Duffinian number.

2143531 is a modest number, since divided by 3531 gives 214 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2143499 and 2143508.

It is not an unprimeable number, because it can be changed into a prime (2143501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19980 + ... + 20086.

It is an arithmetic number, because the mean of its divisors is an integer number (154224).

2^2143531 is an apocalyptic number.

2143531 is a deficient number, since it is larger than the sum of its proper divisors (324053).

2143531 is a wasteful number, since it uses less digits than its factorization.

2143531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210.

The product of its digits is 360, while the sum is 19.

The square root of 2143531 is about 1464.0802573630. The cubic root of 2143531 is about 128.9367115388.

Adding to 2143531 its reverse (1353412), we get a palindrome (3496943).

The spelling of 2143531 in words is "two million, one hundred forty-three thousand, five hundred thirty-one".