5478199981 has 2 divisors, whose sum is σ = 5478199982. Its totient is φ = 5478199980.

The previous prime is 5478199967. The next prime is 5478200069. The reversal of 5478199981 is 1899918745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5191202500 + 286997481 = 72050^2 + 16941^2 .

It is a cyclic number.

It is not a de Polignac number, because 5478199981 - 2²¹ = 5476102829 is a prime.

It is a super-2 number, since 2×5478199981² = 60021350063656800722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5478199081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739099990 + 2739099991.

It is an arithmetic number, because the mean of its divisors is an integer number (2739099991).

Almost surely, 2^5478199981 is an apocalyptic number.

It is an amenable number.

5478199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5478199981 is an equidigital number, since it uses as much as digits as its factorization.

5478199981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 61.

The square root of 5478199981 is about 74014.8632438107. The cubic root of 5478199981 is about 1762.8389080250.

The spelling of 5478199981 in words is "five billion, four hundred seventy-eight million, one hundred ninety-nine thousand, nine hundred eighty-one".