1815494854 has 4 divisors (see below), whose sum is σ = 2723242284. Its totient is φ = 907747426.

The previous prime is 1815494843. The next prime is 1815494861. The reversal of 1815494854 is 4584945181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4584945181 = 6997 ⋅655273.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1815494798 and 1815494807.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 453873712 + ... + 453873715.

It is an arithmetic number, because the mean of its divisors is an integer number (680810571).

Almost surely, 2^1815494854 is an apocalyptic number.

1815494854 is a deficient number, since it is larger than the sum of its proper divisors (907747430).

1815494854 is an equidigital number, since it uses as much as digits as its factorization.

1815494854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907747429.

The product of its digits is 921600, while the sum is 49.

The square root of 1815494854 is about 42608.6241739862. The cubic root of 1815494854 is about 1219.9209063657.

The spelling of 1815494854 in words is "one billion, eight hundred fifteen million, four hundred ninety-four thousand, eight hundred fifty-four".