2681789797 has 8 divisors (see below), whose sum is σ = 2840175576. Its totient is φ = 2523474432.

The previous prime is 2681789681. The next prime is 2681789801. The reversal of 2681789797 is 7979871862.

It is a happy number.

It is a Cunningham number, because it is equal to 51786²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1323940996 + 1357848801 = 36386^2 + 36849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2681789797 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 (2681789197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74683 + ... + 104599.

It is an arithmetic number, because the mean of its divisors is an integer number (355021947).

Almost surely, 2^2681789797 is an apocalyptic number.

It is an amenable number.

2681789797 is a deficient number, since it is larger than the sum of its proper divisors (158385779).

2681789797 is a wasteful number, since it uses less digits than its factorization.

2681789797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35207.

The product of its digits is 21337344, while the sum is 64.

The square root of 2681789797 is about 51786.0000096551. Note that the first 5 decimals coincide. The cubic root of 2681789797 is about 1389.3390569229.

The spelling of 2681789797 in words is "two billion, six hundred eighty-one million, seven hundred eighty-nine thousand, seven hundred ninety-seven".