1618131081 has 8 divisors (see below), whose sum is σ = 2465723584. Its totient is φ = 924646320.

The previous prime is 1618131061. The next prime is 1618131089. The reversal of 1618131081 is 1801318161.

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

It is not a de Polignac number, because 1618131081 - 2⁶ = 1618131017 is a prime.

It is a super-2 number, since 2×1618131081² = 5236696390596457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618131089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38526910 + ... + 38526951.

It is an arithmetic number, because the mean of its divisors is an integer number (308215448).

Almost surely, 2^1618131081 is an apocalyptic number.

It is an amenable number.

1618131081 is a deficient number, since it is larger than the sum of its proper divisors (847592503).

1618131081 is an equidigital number, since it uses as much as digits as its factorization.

1618131081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77053871.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 1618131081 is about 40226.0000621489. Note that the first 4 decimals coincide. The cubic root of 1618131081 is about 1174.0084784051.

The spelling of 1618131081 in words is "one billion, six hundred eighteen million, one hundred thirty-one thousand, eighty-one".