1820181011 has 8 divisors (see below), whose sum is σ = 1996747200. Its totient is φ = 1645464040.

The previous prime is 1820181001. The next prime is 1820181017. The reversal of 1820181011 is 1101810281.

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

It is not a de Polignac number, because 1820181011 - 2¹⁴ = 1820164627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820181017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460241 + ... + 464178.

It is an arithmetic number, because the mean of its divisors is an integer number (249593400).

Almost surely, 2^1820181011 is an apocalyptic number.

1820181011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1820181011 is a deficient number, since it is larger than the sum of its proper divisors (176566189).

1820181011 is a wasteful number, since it uses less digits than its factorization.

1820181011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924609.

The product of its (nonzero) digits is 128, while the sum is 23.

The square root of 1820181011 is about 42663.5794442989. The cubic root of 1820181011 is about 1220.9696248897.

Adding to 1820181011 its reverse (1101810281), we get a palindrome (2921991292).

The spelling of 1820181011 in words is "one billion, eight hundred twenty million, one hundred eighty-one thousand, eleven".