1215671 has 4 divisors (see below), whose sum is σ = 1222872. Its totient is φ = 1208472.

The previous prime is 1215649. The next prime is 1215673. The reversal of 1215671 is 1765121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215671 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 (1215673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3341 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (305718).

2^1215671 is an apocalyptic number.

1215671 is a deficient number, since it is larger than the sum of its proper divisors (7201).

1215671 is an equidigital number, since it uses as much as digits as its factorization.

1215671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200.

The product of its digits is 420, while the sum is 23.

The square root of 1215671 is about 1102.5747140217. The cubic root of 1215671 is about 106.7264389387.

The spelling of 1215671 in words is "one million, two hundred fifteen thousand, six hundred seventy-one".