1216761 has 16 divisors (see below), whose sum is σ = 1997184. Its totient is φ = 641664.

The previous prime is 1216759. The next prime is 1216763. The reversal of 1216761 is 1676121.

It is an interprime number because it is at equal distance from previous prime (1216759) and next prime (1216763).

It is not a de Polignac number, because 1216761 - 2¹ = 1216759 is a prime.

It is a super-2 number, since 2×1216761² = 2961014662242, which contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1956 + ... + 2501.

It is an arithmetic number, because the mean of its divisors is an integer number (124824).

2^1216761 is an apocalyptic number.

It is an amenable number.

1216761 is a deficient number, since it is larger than the sum of its proper divisors (780423).

1216761 is a wasteful number, since it uses less digits than its factorization.

1216761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480.

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

The square root of 1216761 is about 1103.0689008398. The cubic root of 1216761 is about 106.7583272448.

The spelling of 1216761 in words is "one million, two hundred sixteen thousand, seven hundred sixty-one".