1206681 has 16 divisors (see below), whose sum is σ = 1889664. Its totient is φ = 670464.

The previous prime is 1206679. The next prime is 1206683. The reversal of 1206681 is 1866021.

1206681 is a nontrivial binomial coefficient, being equal to C(1554, 2).

It is an interprime number because it is at equal distance from previous prime (1206679) and next prime (1206683).

It is not a de Polignac number, because 1206681 - 2¹ = 1206679 is a prime.

It is a super-2 number, since 2×1206681² = 2912158071522, which contains 22 as substring.

1206681 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206683) 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, 1 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (118104).

2^1206681 is an apocalyptic number.

1206681 is the 1553-rd triangular number and also the 777-th hexagonal number.

It is an amenable number.

1206681 is a deficient number, since it is larger than the sum of its proper divisors (682983).

1206681 is a wasteful number, since it uses less digits than its factorization.

1206681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1206681 is about 1098.4903276770. The cubic root of 1206681 is about 106.4627037735.

The spelling of 1206681 in words is "one million, two hundred six thousand, six hundred eighty-one".