1881138167 has 4 divisors (see below), whose sum is σ = 1881612336. Its totient is φ = 1880664000.

The previous prime is 1881138151. The next prime is 1881138173. The reversal of 1881138167 is 7618311881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1881138167 - 2⁴ = 1881138151 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 (1881138107) 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, 231083 + ... + 239084.

It is an arithmetic number, because the mean of its divisors is an integer number (470403084).

Almost surely, 2^1881138167 is an apocalyptic number.

1881138167 is a deficient number, since it is larger than the sum of its proper divisors (474169).

1881138167 is an equidigital number, since it uses as much as digits as its factorization.

1881138167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474168.

The product of its digits is 64512, while the sum is 44.

The square root of 1881138167 is about 43372.0897236921. The cubic root of 1881138167 is about 1234.4501733865.

The spelling of 1881138167 in words is "one billion, eight hundred eighty-one million, one hundred thirty-eight thousand, one hundred sixty-seven".