1963691 has 2 divisors, whose sum is σ = 1963692. Its totient is φ = 1963690.

The previous prime is 1963679. The next prime is 1963693.

1963691 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1963691 - 2¹⁴ = 1947307 is a prime.

Together with 1963693, 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 (1963693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981845 + 981846.

It is an arithmetic number, because the mean of its divisors is an integer number (981846).

2^1963691 is an apocalyptic number.

1963691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963691 is an equidigital number, since it uses as much as digits as its factorization.

1963691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 1963691 is about 1401.3175942662. The cubic root of 1963691 is about 125.2250027471.

The spelling of 1963691 in words is "one million, nine hundred sixty-three thousand, six hundred ninety-one".