1218961 has 4 divisors (see below), whose sum is σ = 1221952. Its totient is φ = 1215972.

The previous prime is 1218953. The next prime is 1218989. The reversal of 1218961 is 1698121.

It is a happy number.

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 1218961 - 2³ = 1218953 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218901) 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, 765 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (305488).

2^1218961 is an apocalyptic number.

It is an amenable number.

1218961 is a deficient number, since it is larger than the sum of its proper divisors (2991).

1218961 is an equidigital number, since it uses as much as digits as its factorization.

1218961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990.

The product of its digits is 864, while the sum is 28.

The square root of 1218961 is about 1104.0656683368. The cubic root of 1218961 is about 106.8226310011.

The spelling of 1218961 in words is "one million, two hundred eighteen thousand, nine hundred sixty-one".