2081531 has 4 divisors (see below), whose sum is σ = 2203992. Its totient is φ = 1959072.

The previous prime is 2081491. The next prime is 2081537. The reversal of 2081531 is 1351802.

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

It is a cyclic number.

It is not a de Polignac number, because 2081531 - 2⁶ = 2081467 is a prime.

It is a super-2 number, since 2×2081531² = 8665542607922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081537) 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, 61205 + ... + 61238.

It is an arithmetic number, because the mean of its divisors is an integer number (550998).

2^2081531 is an apocalyptic number.

2081531 is a deficient number, since it is larger than the sum of its proper divisors (122461).

2081531 is a wasteful number, since it uses less digits than its factorization.

2081531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122460.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2081531 is about 1442.7511913008. The cubic root of 2081531 is about 127.6813975720.

It can be divided in two parts, 2081 and 531, that multiplied together give a palindrome (1105011).

The spelling of 2081531 in words is "two million, eighty-one thousand, five hundred thirty-one".