1960991 has 2 divisors, whose sum is σ = 1960992. Its totient is φ = 1960990.

The previous prime is 1960979. The next prime is 1960993. The reversal of 1960991 is 1990691.

It is a strong prime.

It is an emirp because it is prime and its reverse (1990691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1960991 - 2¹⁰ = 1959967 is a prime.

Together with 1960993, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1960993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980495 + 980496.

It is an arithmetic number, because the mean of its divisors is an integer number (980496).

2^1960991 is an apocalyptic number.

1960991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1960991 is an equidigital number, since it uses as much as digits as its factorization.

1960991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1960991 is about 1400.3538838451. The cubic root of 1960991 is about 125.1675832265.

The spelling of 1960991 in words is "one million, nine hundred sixty thousand, nine hundred ninety-one".