1667121 has 4 divisors (see below), whose sum is σ = 2222832. Its totient is φ = 1111412.

The previous prime is 1667077. The next prime is 1667131. The reversal of 1667121 is 1217661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1667121 - 2¹¹ = 1665073 is a prime.

It is a D-number.

1667121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1667091 and 1667100.

It is not an unprimeable number, because it can be changed into a prime (1667131) 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, 277851 + ... + 277856.

It is an arithmetic number, because the mean of its divisors is an integer number (555708).

2^1667121 is an apocalyptic number.

It is an amenable number.

1667121 is a deficient number, since it is larger than the sum of its proper divisors (555711).

1667121 is an equidigital number, since it uses as much as digits as its factorization.

1667121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555710.

The product of its digits is 504, while the sum is 24.

The square root of 1667121 is about 1291.1703992890. The cubic root of 1667121 is about 118.5738826055.

The spelling of 1667121 in words is "one million, six hundred sixty-seven thousand, one hundred twenty-one".