5681821137 has 16 divisors (see below), whose sum is σ = 7623400512. Its totient is φ = 3764093760.

The previous prime is 5681821111. The next prime is 5681821151. The reversal of 5681821137 is 7311281865.

It is not a de Polignac number, because 5681821137 - 2¹⁰ = 5681820113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5681821157) 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 15 ways as a sum of consecutive naturals, for example, 902043 + ... + 908319.

It is an arithmetic number, because the mean of its divisors is an integer number (476462532).

Almost surely, 2^5681821137 is an apocalyptic number.

It is an amenable number.

5681821137 is a deficient number, since it is larger than the sum of its proper divisors (1941579375).

5681821137 is a wasteful number, since it uses less digits than its factorization.

5681821137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8128.

The product of its digits is 80640, while the sum is 42.

The square root of 5681821137 is about 75377.8557468969. The cubic root of 5681821137 is about 1784.4149481241.

The spelling of 5681821137 in words is "five billion, six hundred eighty-one million, eight hundred twenty-one thousand, one hundred thirty-seven".