1618181243 has 12 divisors (see below), whose sum is σ = 1883378952. Its totient is φ = 1386272160.

The previous prime is 1618181239. The next prime is 1618181249. The reversal of 1618181243 is 3421818161.

It is not a de Polignac number, because 1618181243 - 2² = 1618181239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1618181249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96671 + ... + 112167.

It is an arithmetic number, because the mean of its divisors is an integer number (156948246).

Almost surely, 2^1618181243 is an apocalyptic number.

1618181243 is a deficient number, since it is larger than the sum of its proper divisors (265197709).

1618181243 is a wasteful number, since it uses less digits than its factorization.

1618181243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17642 (or 17635 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1618181243 is about 40226.6235595283. The cubic root of 1618181243 is about 1174.0206096853.

The spelling of 1618181243 in words is "one billion, six hundred eighteen million, one hundred eighty-one thousand, two hundred forty-three".