5278437581 has 8 divisors (see below), whose sum is σ = 5508778680. Its totient is φ = 5051318272.

The previous prime is 5278437551. The next prime is 5278437589. The reversal of 5278437581 is 1857348725.

It can be written as a sum of positive squares in 4 ways, for example, as 31753225 + 5246684356 = 5635^2 + 72434^2 .

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-5278437581 is a prime.

It is a super-2 number, since 2×5278437581² = 55723806593026263122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5278437589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802100 + ... + 808653.

It is an arithmetic number, because the mean of its divisors is an integer number (688597335).

Almost surely, 2^5278437581 is an apocalyptic number.

It is an amenable number.

5278437581 is a deficient number, since it is larger than the sum of its proper divisors (230341099).

5278437581 is a wasteful number, since it uses less digits than its factorization.

5278437581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610895.

The product of its digits is 1881600, while the sum is 50.

The square root of 5278437581 is about 72652.8566609738. The cubic root of 5278437581 is about 1741.1457619714.

The spelling of 5278437581 in words is "five billion, two hundred seventy-eight million, four hundred thirty-seven thousand, five hundred eighty-one".