1206691 has 2 divisors, whose sum is σ = 1206692. Its totient is φ = 1206690.

The previous prime is 1206683. The next prime is 1206701. The reversal of 1206691 is 1966021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1206691 - 2³ = 1206683 is a prime.

It is a super-2 number, since 2×1206691² = 2912206338962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1206391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603345 + 603346.

It is an arithmetic number, because the mean of its divisors is an integer number (603346).

2^1206691 is an apocalyptic number.

1206691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206691 is an equidigital number, since it uses as much as digits as its factorization.

1206691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1206691 is about 1098.4948793690. The cubic root of 1206691 is about 106.4629978651.

The spelling of 1206691 in words is "one million, two hundred six thousand, six hundred ninety-one".