1121021977 has 2 divisors, whose sum is σ = 1121021978. Its totient is φ = 1121021976.

The previous prime is 1121021971. The next prime is 1121022011. The reversal of 1121021977 is 7791201211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 700607961 + 420414016 = 26469^2 + 20504^2 .

It is an emirp because it is prime and its reverse (7791201211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121021977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121021971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560510988 + 560510989.

It is an arithmetic number, because the mean of its divisors is an integer number (560510989).

Almost surely, 2^1121021977 is an apocalyptic number.

It is an amenable number.

1121021977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121021977 is an equidigital number, since it uses as much as digits as its factorization.

1121021977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 31.

The square root of 1121021977 is about 33481.6662817130. Note that the first 3 decimals coincide. The cubic root of 1121021977 is about 1038.8145939598.

The spelling of 1121021977 in words is "one billion, one hundred twenty-one million, twenty-one thousand, nine hundred seventy-seven".