2031531 has 4 divisors (see below), whose sum is σ = 2708712. Its totient is φ = 1354352.

The previous prime is 2031493. The next prime is 2031541. The reversal of 2031531 is 1351302.

It is a happy number.

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 2031531 - 2⁶ = 2031467 is a prime.

It is a super-2 number, since 2×2031531² = 8254236407922, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2031531.

It is not an unprimeable number, because it can be changed into a prime (2031541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338586 + ... + 338591.

It is an arithmetic number, because the mean of its divisors is an integer number (677178).

2^2031531 is an apocalyptic number.

2031531 is a deficient number, since it is larger than the sum of its proper divisors (677181).

2031531 is an equidigital number, since it uses as much as digits as its factorization.

2031531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677180.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 2031531 is about 1425.3178592861. The cubic root of 2031531 is about 126.6507651630.

Adding to 2031531 its reverse (1351302), we get a palindrome (3382833).

The spelling of 2031531 in words is "two million, thirty-one thousand, five hundred thirty-one".