9977971 has 2 divisors, whose sum is σ = 9977972. Its totient is φ = 9977970.

The previous prime is 9977951. The next prime is 9977977. The reversal of 9977971 is 1797799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9977971 - 2²³ = 1589363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9977977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988985 + 4988986.

It is an arithmetic number, because the mean of its divisors is an integer number (4988986).

Almost surely, 2^9977971 is an apocalyptic number.

9977971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9977971 is an equidigital number, since it uses as much as digits as its factorization.

9977971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250047, while the sum is 49.

The square root of 9977971 is about 3158.7926490987. The cubic root of 9977971 is about 215.2851525552.

The spelling of 9977971 in words is "nine million, nine hundred seventy-seven thousand, nine hundred seventy-one".