2145431 has 4 divisors (see below), whose sum is σ = 2180664. Its totient is φ = 2110200.

The previous prime is 2145421. The next prime is 2145433. The reversal of 2145431 is 1345412.

2145431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2145431 - 2¹⁰ = 2144407 is a prime.

It is a super-2 number, since 2×2145431² = 9205748351522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17525 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (545166).

2^2145431 is an apocalyptic number.

2145431 is a deficient number, since it is larger than the sum of its proper divisors (35233).

2145431 is an equidigital number, since it uses as much as digits as its factorization.

2145431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35232.

The product of its digits is 480, while the sum is 20.

The square root of 2145431 is about 1464.7289851710. The cubic root of 2145431 is about 128.9747962699.

The spelling of 2145431 in words is "two million, one hundred forty-five thousand, four hundred thirty-one".