1618181242 has 8 divisors (see below), whose sum is σ = 2432042100. Its totient is φ = 807500544.

The previous prime is 1618181239. The next prime is 1618181249. The reversal of 1618181242 is 2421818161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1541426121 + 76755121 = 39261^2 + 8761^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1618181198 and 1618181207.

It is not an unprimeable number, because it can be changed into a prime (1618181249) 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 3 ways as a sum of consecutive naturals, for example, 793767 + ... + 795802.

Almost surely, 2^1618181242 is an apocalyptic number.

1618181242 is a deficient number, since it is larger than the sum of its proper divisors (813860858).

1618181242 is a wasteful number, since it uses less digits than its factorization.

1618181242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590080.

The product of its digits is 6144, while the sum is 34.

The square root of 1618181242 is about 40226.6235470988. The cubic root of 1618181242 is about 1174.0206094435.

The spelling of 1618181242 in words is "one billion, six hundred eighteen million, one hundred eighty-one thousand, two hundred forty-two".