1667261 has 4 divisors (see below), whose sum is σ = 1683552. Its totient is φ = 1650972.

The previous prime is 1667251. The next prime is 1667279. The reversal of 1667261 is 1627661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1627661 = 7 ⋅232523.

It is a cyclic number.

It is not a de Polignac number, because 1667261 - 2¹⁰ = 1666237 is a prime.

It is a super-3 number, since 3×1667261³ = 13903752521333701743, 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 (1667251) 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, 7991 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (420888).

2^1667261 is an apocalyptic number.

It is an amenable number.

1667261 is a deficient number, since it is larger than the sum of its proper divisors (16291).

1667261 is a wasteful number, since it uses less digits than its factorization.

1667261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16290.

The product of its digits is 3024, while the sum is 29.

The square root of 1667261 is about 1291.2246125287. The cubic root of 1667261 is about 118.5772016765.

The spelling of 1667261 in words is "one million, six hundred sixty-seven thousand, two hundred sixty-one".