996756421 has 2 divisors, whose sum is σ = 996756422. Its totient is φ = 996756420.

The previous prime is 996756403. The next prime is 996756457. The reversal of 996756421 is 124657699.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894847396 + 101909025 = 29914^2 + 10095^2 .

It is a cyclic number.

It is not a de Polignac number, because 996756421 - 2⁹ = 996755909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996756721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498378210 + 498378211.

It is an arithmetic number, because the mean of its divisors is an integer number (498378211).

Almost surely, 2^996756421 is an apocalyptic number.

It is an amenable number.

996756421 is a deficient number, since it is larger than the sum of its proper divisors (1).

996756421 is an equidigital number, since it uses as much as digits as its factorization.

996756421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 996756421 is about 31571.4494599155. The cubic root of 996756421 is about 998.9176359106.

The spelling of 996756421 in words is "nine hundred ninety-six million, seven hundred fifty-six thousand, four hundred twenty-one".