2278996981 has 4 divisors (see below), whose sum is σ = 2340591532. Its totient is φ = 2217402432.

The previous prime is 2278996969. The next prime is 2278996997. The reversal of 2278996981 is 1896998722.

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 776736900 + 1502260081 = 27870^2 + 38759^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278996981 - 2²¹ = 2276899829 is a prime.

It is a super-3 number, since 3×2278996981³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278996921) 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, 30797220 + ... + 30797293.

It is an arithmetic number, because the mean of its divisors is an integer number (585147883).

Almost surely, 2^2278996981 is an apocalyptic number.

It is an amenable number.

2278996981 is a deficient number, since it is larger than the sum of its proper divisors (61594551).

2278996981 is an equidigital number, since it uses as much as digits as its factorization.

2278996981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61594550.

The product of its digits is 7838208, while the sum is 61.

The square root of 2278996981 is about 47738.8414291759. The cubic root of 2278996981 is about 1315.9758414664.

The spelling of 2278996981 in words is "two billion, two hundred seventy-eight million, nine hundred ninety-six thousand, nine hundred eighty-one".