1801820911 has 16 divisors (see below), whose sum is σ = 1992794400. Its totient is φ = 1615504000.

The previous prime is 1801820893. The next prime is 1801820927. The reversal of 1801820911 is 1190281081.

It is not a de Polignac number, because 1801820911 - 2¹⁵ = 1801788143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801820971) 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, 295845 + ... + 301873.

It is an arithmetic number, because the mean of its divisors is an integer number (124549650).

Almost surely, 2^1801820911 is an apocalyptic number.

1801820911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1801820911 is a deficient number, since it is larger than the sum of its proper divisors (190973489).

1801820911 is a wasteful number, since it uses less digits than its factorization.

1801820911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 1801820911 is about 42447.8610886344. The cubic root of 1801820911 is about 1216.8504515596.

The spelling of 1801820911 in words is "one billion, eight hundred one million, eight hundred twenty thousand, nine hundred eleven".