955991 has 2 divisors, whose sum is σ = 955992. Its totient is φ = 955990.

The previous prime is 955987. The next prime is 955993. The reversal of 955991 is 199559.

It is a strong prime.

It is an emirp because it is prime and its reverse (199559) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 955991 - 2² = 955987 is a prime.

Together with 955993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (955993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 477995 + 477996.

It is an arithmetic number, because the mean of its divisors is an integer number (477996).

2⁹⁵⁵⁹⁹¹ is an apocalyptic number.

955991 is a deficient number, since it is larger than the sum of its proper divisors (1).

955991 is an equidigital number, since it uses as much as digits as its factorization.

955991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18225, while the sum is 38.

The square root of 955991 is about 977.7479225240. The cubic root of 955991 is about 98.5109713187.

The spelling of 955991 in words is "nine hundred fifty-five thousand, nine hundred ninety-one".