1820881167 has 16 divisors (see below), whose sum is σ = 2800611072. Its totient is φ = 1030777920.

The previous prime is 1820881151. The next prime is 1820881189. The reversal of 1820881167 is 7611880281.

It is not a de Polignac number, because 1820881167 - 2⁴ = 1820881151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820889167) 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, 402934 + ... + 407427.

It is an arithmetic number, because the mean of its divisors is an integer number (175038192).

Almost surely, 2^1820881167 is an apocalyptic number.

1820881167 is a deficient number, since it is larger than the sum of its proper divisors (979729905).

1820881167 is a wasteful number, since it uses less digits than its factorization.

1820881167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810478.

The product of its (nonzero) digits is 43008, while the sum is 42.

The square root of 1820881167 is about 42671.7842022102. The cubic root of 1820881167 is about 1221.1261587023.

The spelling of 1820881167 in words is "one billion, eight hundred twenty million, eight hundred eighty-one thousand, one hundred sixty-seven".