1975691 has 2 divisors, whose sum is σ = 1975692. Its totient is φ = 1975690.

The previous prime is 1975669. The next prime is 1975693. The reversal of 1975691 is 1965791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1975691 - 2⁶ = 1975627 is a prime.

Together with 1975693, 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 (1975693) 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, 987845 + 987846.

It is an arithmetic number, because the mean of its divisors is an integer number (987846).

2^1975691 is an apocalyptic number.

1975691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975691 is an equidigital number, since it uses as much as digits as its factorization.

1975691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 38.

The square root of 1975691 is about 1405.5927575226. The cubic root of 1975691 is about 125.4795657804.

The spelling of 1975691 in words is "one million, nine hundred seventy-five thousand, six hundred ninety-one".