2531641 has 4 divisors (see below), whose sum is σ = 2893312. Its totient is φ = 2169972.

The previous prime is 2531629. The next prime is 2531653. The reversal of 2531641 is 1461352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2531629) and next prime (2531653).

It is not a de Polignac number, because 2531641 - 2⁵ = 2531609 is a prime.

It is a Duffinian number.

2531641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2531611) 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, 180825 + ... + 180838.

It is an arithmetic number, because the mean of its divisors is an integer number (723328).

2^2531641 is an apocalyptic number.

It is an amenable number.

2531641 is a deficient number, since it is larger than the sum of its proper divisors (361671).

2531641 is an equidigital number, since it uses as much as digits as its factorization.

2531641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361670.

The product of its digits is 720, while the sum is 22.

The square root of 2531641 is about 1591.1131323699. The cubic root of 2531641 is about 136.2910613273.

Adding to 2531641 its reverse (1461352), we get a palindrome (3992993).

The spelling of 2531641 in words is "two million, five hundred thirty-one thousand, six hundred forty-one".