2102778481 has 2 divisors, whose sum is σ = 2102778482. Its totient is φ = 2102778480.

The previous prime is 2102778479. The next prime is 2102778493. The reversal of 2102778481 is 1848772012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1443316081 + 659462400 = 37991^2 + 25680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102778481 - 2¹ = 2102778479 is a prime.

It is a super-2 number, since 2×2102778481² = 8843354680313334722, which contains 22 as substring.

Together with 2102778479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2102778421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051389240 + 1051389241.

It is an arithmetic number, because the mean of its divisors is an integer number (1051389241).

Almost surely, 2^2102778481 is an apocalyptic number.

It is an amenable number.

2102778481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102778481 is an equidigital number, since it uses as much as digits as its factorization.

2102778481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 2102778481 is about 45856.0626417053. The cubic root of 2102778481 is about 1281.1436882927.

The spelling of 2102778481 in words is "two billion, one hundred two million, seven hundred seventy-eight thousand, four hundred eighty-one".