2641531909 has 4 divisors (see below), whose sum is σ = 2641898700. Its totient is φ = 2641165120.

The previous prime is 2641531889. The next prime is 2641531913. The reversal of 2641531909 is 9091351462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2232279009 + 409252900 = 47247^2 + 20230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2641531909 - 2⁵ = 2641531877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641541909) 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, 172372 + ... + 187069.

It is an arithmetic number, because the mean of its divisors is an integer number (660474675).

Almost surely, 2^2641531909 is an apocalyptic number.

It is an amenable number.

2641531909 is a deficient number, since it is larger than the sum of its proper divisors (366791).

2641531909 is an equidigital number, since it uses as much as digits as its factorization.

2641531909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366790.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 2641531909 is about 51395.8355219564. The cubic root of 2641531909 is about 1382.3519210679.

The spelling of 2641531909 in words is "two billion, six hundred forty-one million, five hundred thirty-one thousand, nine hundred nine".