2091531 has 8 divisors (see below), whose sum is σ = 3003280. Its totient is φ = 1287072.

The previous prime is 2091521. The next prime is 2091553. The reversal of 2091531 is 1351902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2091531 - 2¹³ = 2083339 is a prime.

It is a super-2 number, since 2×2091531² = 8749003847922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2091498 and 2091507.

It is not an unprimeable number, because it can be changed into a prime (2091521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26776 + ... + 26853.

It is an arithmetic number, because the mean of its divisors is an integer number (375410).

2^2091531 is an apocalyptic number.

2091531 is a deficient number, since it is larger than the sum of its proper divisors (911749).

2091531 is a wasteful number, since it uses less digits than its factorization.

2091531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53645.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 2091531 is about 1446.2126399669. The cubic root of 2091531 is about 127.8855381371.

The spelling of 2091531 in words is "two million, ninety-one thousand, five hundred thirty-one".