1813105644 has 36 divisors (see below), whose sum is σ = 4921288344. Its totient is φ = 518030016.

The previous prime is 1813105643. The next prime is 1813105669. The reversal of 1813105644 is 4465013181.

It is not an unprimeable number, because it can be changed into a prime (1813105643) 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, 1541169 + ... + 1542344.

It is an arithmetic number, because the mean of its divisors is an integer number (136702454).

Almost surely, 2^1813105644 is an apocalyptic number.

1813105644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1813105644 is an abundant number, since it is smaller than the sum of its proper divisors (3108182700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1813105644 is a wasteful number, since it uses less digits than its factorization.

1813105644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083534 (or 3083525 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1813105644 is about 42580.5782487744. The cubic root of 1813105644 is about 1219.3855286005.

The spelling of 1813105644 in words is "one billion, eight hundred thirteen million, one hundred five thousand, six hundred forty-four".