1815042243 has 16 divisors (see below), whose sum is σ = 2833238016. Its totient is φ = 1011869760.

The previous prime is 1815042233. The next prime is 1815042277. The reversal of 1815042243 is 3422405181.

It is not a de Polignac number, because 1815042243 - 2²¹ = 1812945091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1815042243.

It is not an unprimeable number, because it can be changed into a prime (1815042233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1053171 + ... + 1054892.

It is an arithmetic number, because the mean of its divisors is an integer number (177077376).

Almost surely, 2^1815042243 is an apocalyptic number.

1815042243 is a deficient number, since it is larger than the sum of its proper divisors (1018195773).

1815042243 is a wasteful number, since it uses less digits than its factorization.

1815042243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108114.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 1815042243 is about 42603.3125824741. The cubic root of 1815042243 is about 1219.8195206910.

The spelling of 1815042243 in words is "one billion, eight hundred fifteen million, forty-two thousand, two hundred forty-three".