994361681 has 2 divisors, whose sum is σ = 994361682. Its totient is φ = 994361680.

The previous prime is 994361623. The next prime is 994361701. The reversal of 994361681 is 186163499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 918393025 + 75968656 = 30305^2 + 8716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994361681 is a prime.

It is a super-2 number, since 2×994361681² = 1977510305282291522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (994363681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497180840 + 497180841.

It is an arithmetic number, because the mean of its divisors is an integer number (497180841).

Almost surely, 2^994361681 is an apocalyptic number.

It is an amenable number.

994361681 is a deficient number, since it is larger than the sum of its proper divisors (1).

994361681 is an equidigital number, since it uses as much as digits as its factorization.

994361681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 994361681 is about 31533.5009315490. The cubic root of 994361681 is about 998.1170169336.

The spelling of 994361681 in words is "nine hundred ninety-four million, three hundred sixty-one thousand, six hundred eighty-one".