5815381861 has 4 divisors (see below), whose sum is σ = 6015912300. Its totient is φ = 5614851424.

The previous prime is 5815381837. The next prime is 5815381907. The reversal of 5815381861 is 1681835185.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1766604961 + 4048776900 = 42031^2 + 63630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5815381861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5815381961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100265176 + ... + 100265233.

It is an arithmetic number, because the mean of its divisors is an integer number (1503978075).

Almost surely, 2^5815381861 is an apocalyptic number.

It is an amenable number.

5815381861 is a deficient number, since it is larger than the sum of its proper divisors (200530439).

5815381861 is a wasteful number, since it uses less digits than its factorization.

5815381861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200530438.

The product of its digits is 230400, while the sum is 46.

The square root of 5815381861 is about 76258.6510567817. The cubic root of 5815381861 is about 1798.2886884404.

The spelling of 5815381861 in words is "five billion, eight hundred fifteen million, three hundred eighty-one thousand, eight hundred sixty-one".