1618873141 has 4 divisors (see below), whose sum is σ = 1619171884. Its totient is φ = 1618574400.

The previous prime is 1618873133. The next prime is 1618873187. The reversal of 1618873141 is 1413788161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1413788161 = 163 ⋅8673547.

It can be written as a sum of positive squares in 2 ways, for example, as 927446116 + 691427025 = 30454^2 + 26295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618873141 - 2³ = 1618873133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618873094 and 1618873103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618873441) 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, 141090 + ... + 152131.

It is an arithmetic number, because the mean of its divisors is an integer number (404792971).

Almost surely, 2^1618873141 is an apocalyptic number.

It is an amenable number.

1618873141 is a deficient number, since it is larger than the sum of its proper divisors (298743).

1618873141 is an equidigital number, since it uses as much as digits as its factorization.

1618873141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298742.

The product of its digits is 32256, while the sum is 40.

The square root of 1618873141 is about 40235.2226413624. Note that the first 3 decimals coincide. The cubic root of 1618873141 is about 1174.1879141346.

The spelling of 1618873141 in words is "one billion, six hundred eighteen million, eight hundred seventy-three thousand, one hundred forty-one".