1200691 has 2 divisors, whose sum is σ = 1200692. Its totient is φ = 1200690.

The previous prime is 1200679. The next prime is 1200697. The reversal of 1200691 is 1960021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200691 - 2⁹ = 1200179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600345 + 600346.

It is an arithmetic number, because the mean of its divisors is an integer number (600346).

2^1200691 is an apocalyptic number.

1200691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200691 is an equidigital number, since it uses as much as digits as its factorization.

1200691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1200691 is about 1095.7604665254. The cubic root of 1200691 is about 106.2862501453.

It can be divided in two parts, 1200 and 691, that added together give a triangular number (1891 = T₆₁).

The spelling of 1200691 in words is "one million, two hundred thousand, six hundred ninety-one".