9945977 has 2 divisors, whose sum is σ = 9945978. Its totient is φ = 9945976.

The previous prime is 9945967. The next prime is 9945979. The reversal of 9945977 is 7795499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9339136 + 606841 = 3056^2 + 779^2 .

It is an emirp because it is prime and its reverse (7795499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9945977 - 2⁴ = 9945961 is a prime.

Together with 9945979, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9945979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972988 + 4972989.

It is an arithmetic number, because the mean of its divisors is an integer number (4972989).

Almost surely, 2^9945977 is an apocalyptic number.

It is an amenable number.

9945977 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945977 is an equidigital number, since it uses as much as digits as its factorization.

9945977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 50.

The square root of 9945977 is about 3153.7243062766. The cubic root of 9945977 is about 215.0548048497.

The spelling of 9945977 in words is "nine million, nine hundred forty-five thousand, nine hundred seventy-seven".