2181401167 has 16 divisors (see below), whose sum is σ = 2514631680. Its totient is φ = 1872842400.

The previous prime is 2181401161. The next prime is 2181401171. The reversal of 2181401167 is 7611041812.

It is not a de Polignac number, because 2181401167 - 2²³ = 2173012559 is a prime.

It is a super-2 number, since 2×2181401167² = 9517022102777923778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181401161) 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, 34584 + ... + 74557.

It is an arithmetic number, because the mean of its divisors is an integer number (157164480).

Almost surely, 2^2181401167 is an apocalyptic number.

2181401167 is a deficient number, since it is larger than the sum of its proper divisors (333230513).

2181401167 is a wasteful number, since it uses less digits than its factorization.

2181401167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109254.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 2181401167 is about 46705.4725594335. The cubic root of 2181401167 is about 1296.9159966733.

Adding to 2181401167 its reverse (7611041812), we get a palindrome (9792442979).

The spelling of 2181401167 in words is "two billion, one hundred eighty-one million, four hundred one thousand, one hundred sixty-seven".