1811497056 has 24 divisors (see below), whose sum is σ = 4755180024. Its totient is φ = 603832320.

The previous prime is 1811497021. The next prime is 1811497057. The reversal of 1811497056 is 6507941181.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 1811496999 and 1811497017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811497057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9434785 + ... + 9434976.

It is an arithmetic number, because the mean of its divisors is an integer number (198132501).

Almost surely, 2^1811497056 is an apocalyptic number.

1811497056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1811497056 is an abundant number, since it is smaller than the sum of its proper divisors (2943682968).

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

1811497056 is a wasteful number, since it uses less digits than its factorization.

1811497056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18869774 (or 18869766 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 1811497056 is about 42561.6853049782. The cubic root of 1811497056 is about 1219.0248088048.

The spelling of 1811497056 in words is "one billion, eight hundred eleven million, four hundred ninety-seven thousand, fifty-six".