1245691 has 2 divisors, whose sum is σ = 1245692. Its totient is φ = 1245690.

The previous prime is 1245689. The next prime is 1245701. The reversal of 1245691 is 1965421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1245691 - 2¹ = 1245689 is a prime.

Together with 1245689, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1245091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622845 + 622846.

It is an arithmetic number, because the mean of its divisors is an integer number (622846).

2^1245691 is an apocalyptic number.

1245691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245691 is an equidigital number, since it uses as much as digits as its factorization.

1245691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 1245691 is about 1116.1052817723. The cubic root of 1245691 is about 107.5978125433.

It can be divided in two parts, 1245 and 691, that added together give a square (1936 = 44²).

The spelling of 1245691 in words is "one million, two hundred forty-five thousand, six hundred ninety-one".