994939561 has 18 divisors (see below), whose sum is σ = 1272167610. Its totient is φ = 775272960.

The previous prime is 994939559. The next prime is 994939571. The reversal of 994939561 is 165939499.

It can be written as a sum of positive squares in only one way, i.e., 856147600 + 138791961 = 29260^2 + 11781^2 .

It is not a de Polignac number, because 994939561 - 2¹ = 994939559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (994939571) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 77976 + ... + 89833.

Almost surely, 2^994939561 is an apocalyptic number.

It is an amenable number.

994939561 is a deficient number, since it is larger than the sum of its proper divisors (277228049).

994939561 is a wasteful number, since it uses less digits than its factorization.

994939561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167845 (or 167827 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 55.

The square root of 994939561 is about 31542.6625540711. The cubic root of 994939561 is about 998.3103336356.

The spelling of 994939561 in words is "nine hundred ninety-four million, nine hundred thirty-nine thousand, five hundred sixty-one".