2681954609 has 4 divisors (see below), whose sum is σ = 2725921140. Its totient is φ = 2637988080.

The previous prime is 2681954579. The next prime is 2681954621. The reversal of 2681954609 is 9064591862.

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 1135892209 + 1546062400 = 33703^2 + 39320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2681954609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681954809) 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, 21983174 + ... + 21983295.

It is an arithmetic number, because the mean of its divisors is an integer number (681480285).

Almost surely, 2^2681954609 is an apocalyptic number.

It is an amenable number.

2681954609 is a deficient number, since it is larger than the sum of its proper divisors (43966531).

2681954609 is an equidigital number, since it uses as much as digits as its factorization.

2681954609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43966530.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 2681954609 is about 51787.5912647036. The cubic root of 2681954609 is about 1389.3675174008.

The spelling of 2681954609 in words is "two billion, six hundred eighty-one million, nine hundred fifty-four thousand, six hundred nine".