996551 has 2 divisors, whose sum is σ = 996552. Its totient is φ = 996550.

The previous prime is 996539. The next prime is 996563. The reversal of 996551 is 155699.

It is a balanced prime because it is at equal distance from previous prime (996539) and next prime (996563).

It is an emirp because it is prime and its reverse (155699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 996551 - 2⁶ = 996487 is a prime.

It is a super-2 number, since 2×996551² = 1986227791202, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498275 + 498276.

It is an arithmetic number, because the mean of its divisors is an integer number (498276).

2⁹⁹⁶⁵⁵¹ is an apocalyptic number.

996551 is a deficient number, since it is larger than the sum of its proper divisors (1).

996551 is an equidigital number, since it uses as much as digits as its factorization.

996551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12150, while the sum is 35.

The square root of 996551 is about 998.2740104801. The cubic root of 996551 is about 99.8849009061.

The spelling of 996551 in words is "nine hundred ninety-six thousand, five hundred fifty-one".