977282921 has 2 divisors, whose sum is σ = 977282922. Its totient is φ = 977282920.

The previous prime is 977282909. The next prime is 977282939. The reversal of 977282921 is 129282779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762367321 + 214915600 = 27611^2 + 14660^2 .

It is an emirp because it is prime and its reverse (129282779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 977282921 - 2¹⁸ = 977020777 is a prime.

It is not a weakly prime, because it can be changed into another prime (977282941) 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, 488641460 + 488641461.

It is an arithmetic number, because the mean of its divisors is an integer number (488641461).

Almost surely, 2^977282921 is an apocalyptic number.

It is an amenable number.

977282921 is a deficient number, since it is larger than the sum of its proper divisors (1).

977282921 is an equidigital number, since it uses as much as digits as its factorization.

977282921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 977282921 is about 31261.5246109335. The cubic root of 977282921 is about 992.3695648836.

The spelling of 977282921 in words is "nine hundred seventy-seven million, two hundred eighty-two thousand, nine hundred twenty-one".