977 has 2 divisors, whose sum is σ = 978.
Its totient is φ = 976.
The previous prime is 971. The next prime is 983. The reversal of 977 is 779.
It is a balanced prime because it is at equal distance from previous prime (971) and next prime (983).
It can be written as a sum of positive squares in only one way, i.e., 961 + 16 = 31^2 + 4^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-977 is a prime.
It is a Chen prime.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (971) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488 + 489.
It is an arithmetic number, because the mean of its divisors is an integer number (489).
2977 is an apocalyptic number.
It is an amenable number.
977 is a deficient number, since it is larger than the sum of its proper divisors (1).
977 is an equidigital number, since it uses as much as digits as its factorization.
977 is an evil number, because the sum of its binary digits is even.
The product of its digits is 441, while the sum is 23.
The square root of 977 is about 31.2569992162.
The cubic root of 977 is about 9.9227379279.
Adding to 977 its sum of digits (23), we get a cube (1000 = 103).
The spelling of 977 in words is "nine hundred seventy-seven", and thus it is an aban number and an oban number.