1955771 has 2 divisors, whose sum is σ = 1955772. Its totient is φ = 1955770.

The previous prime is 1955761. The next prime is 1955773. The reversal of 1955771 is 1775591.

It is a strong prime.

It is an emirp because it is prime and its reverse (1775591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955771 is a prime.

It is a Sophie Germain prime.

Together with 1955773, 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 (1955773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977885 + 977886.

It is an arithmetic number, because the mean of its divisors is an integer number (977886).

2^1955771 is an apocalyptic number.

1955771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955771 is an equidigital number, since it uses as much as digits as its factorization.

1955771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11025, while the sum is 35.

The square root of 1955771 is about 1398.4888272704. The cubic root of 1955771 is about 125.0564225282.

The spelling of 1955771 in words is "one million, nine hundred fifty-five thousand, seven hundred seventy-one".