2638531 has 4 divisors (see below), whose sum is σ = 3015472. Its totient is φ = 2261592.

The previous prime is 2638529. The next prime is 2638543. The reversal of 2638531 is 1358362.

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 2638531 - 2¹ = 2638529 is a prime.

It is a super-2 number, since 2×2638531² = 13923691675922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2638531.

It is not an unprimeable number, because it can be changed into a prime (2638501) 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, 188460 + ... + 188473.

It is an arithmetic number, because the mean of its divisors is an integer number (753868).

2^2638531 is an apocalyptic number.

2638531 is a deficient number, since it is larger than the sum of its proper divisors (376941).

2638531 is an equidigital number, since it uses as much as digits as its factorization.

2638531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376940.

The product of its digits is 4320, while the sum is 28.

The square root of 2638531 is about 1624.3555645240. The cubic root of 2638531 is about 138.1828249659.

The spelling of 2638531 in words is "two million, six hundred thirty-eight thousand, five hundred thirty-one".