2641687531 has 4 divisors (see below), whose sum is σ = 3019071472. Its totient is φ = 2264303592.

The previous prime is 2641687513. The next prime is 2641687547. The reversal of 2641687531 is 1357861462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1357861462 = 2 ⋅678930731.

It is a cyclic number.

It is not a de Polignac number, because 2641687531 - 2⁷ = 2641687403 is a prime.

It is a super-2 number, since 2×2641687531² = 13957026022881751922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2641687561) 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, 188691960 + ... + 188691973.

It is an arithmetic number, because the mean of its divisors is an integer number (754767868).

Almost surely, 2^2641687531 is an apocalyptic number.

2641687531 is a deficient number, since it is larger than the sum of its proper divisors (377383941).

2641687531 is an equidigital number, since it uses as much as digits as its factorization.

2641687531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377383940.

The product of its digits is 241920, while the sum is 43.

The square root of 2641687531 is about 51397.3494550059. The cubic root of 2641687531 is about 1382.3790669506.

The spelling of 2641687531 in words is "two billion, six hundred forty-one million, six hundred eighty-seven thousand, five hundred thirty-one".