8181850381 has 8 divisors (see below), whose sum is σ = 8442080640. Its totient is φ = 7925209728.

The previous prime is 8181850331. The next prime is 8181850399. The reversal of 8181850381 is 1830581818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8181850381 - 2²¹ = 8179753229 is a prime.

It is a super-2 number, since 2×8181850381² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181850331) 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, 892771 + ... + 901888.

It is an arithmetic number, because the mean of its divisors is an integer number (1055260080).

Almost surely, 2^8181850381 is an apocalyptic number.

It is an amenable number.

8181850381 is a deficient number, since it is larger than the sum of its proper divisors (260230259).

8181850381 is a wasteful number, since it uses less digits than its factorization.

8181850381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794803.

The product of its (nonzero) digits is 61440, while the sum is 43.

The square root of 8181850381 is about 90453.5813608284. The cubic root of 8181850381 is about 2015.0408020029.

The spelling of 8181850381 in words is "eight billion, one hundred eighty-one million, eight hundred fifty thousand, three hundred eighty-one".