2145531 has 8 divisors (see below), whose sum is σ = 2886480. Its totient is φ = 1417472.

The previous prime is 2145529. The next prime is 2145547. The reversal of 2145531 is 1355412.

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

It is not a de Polignac number, because 2145531 - 2¹ = 2145529 is a prime.

It is a super-2 number, since 2×2145531² = 9206606543922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145498 and 2145507.

It is not an unprimeable number, because it can be changed into a prime (2145551) 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, 2826 + ... + 3503.

It is an arithmetic number, because the mean of its divisors is an integer number (360810).

2^2145531 is an apocalyptic number.

2145531 is a deficient number, since it is larger than the sum of its proper divisors (740949).

2145531 is a wasteful number, since it uses less digits than its factorization.

2145531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445.

The product of its digits is 600, while the sum is 21.

The square root of 2145531 is about 1464.7631207810. The cubic root of 2145531 is about 128.9768001065.

The spelling of 2145531 in words is "two million, one hundred forty-five thousand, five hundred thirty-one".