1661167 has 4 divisors (see below), whose sum is σ = 1663816. Its totient is φ = 1658520.

The previous prime is 1661161. The next prime is 1661173. The reversal of 1661167 is 7611661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (1661161) and next prime (1661173).

It is a cyclic number.

It is not a de Polignac number, because 1661167 - 2³ = 1661159 is a prime.

It is a super-3 number, since 3×1661167³ = 13751850418189633389, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208 + ... + 1834.

It is an arithmetic number, because the mean of its divisors is an integer number (415954).

2^1661167 is an apocalyptic number.

1661167 is a deficient number, since it is larger than the sum of its proper divisors (2649).

1661167 is a wasteful number, since it uses less digits than its factorization.

1661167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648.

The product of its digits is 1512, while the sum is 28.

The square root of 1661167 is about 1288.8626769365. The cubic root of 1661167 is about 118.4325549252.

The spelling of 1661167 in words is "one million, six hundred sixty-one thousand, one hundred sixty-seven".