4078198781 has 2 divisors, whose sum is σ = 4078198782. Its totient is φ = 4078198780.

The previous prime is 4078198759. The next prime is 4078198837. The reversal of 4078198781 is 1878918704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3982745881 + 95452900 = 63109^2 + 9770^2 .

It is a cyclic number.

It is not a de Polignac number, because 4078198781 - 2³⁰ = 3004456957 is a prime.

It is a super-2 number, since 2×4078198781² = 33263410594699771922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4078198711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039099390 + 2039099391.

It is an arithmetic number, because the mean of its divisors is an integer number (2039099391).

Almost surely, 2^4078198781 is an apocalyptic number.

It is an amenable number.

4078198781 is a deficient number, since it is larger than the sum of its proper divisors (1).

4078198781 is an equidigital number, since it uses as much as digits as its factorization.

4078198781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 53.

The square root of 4078198781 is about 63860.7765455448. The cubic root of 4078198781 is about 1597.6787669946.

The spelling of 4078198781 in words is "four billion, seventy-eight million, one hundred ninety-eight thousand, seven hundred eighty-one".