1121980961 has 2 divisors, whose sum is σ = 1121980962. Its totient is φ = 1121980960.

The previous prime is 1121980939. The next prime is 1121980967. The reversal of 1121980961 is 1690891211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1093294225 + 28686736 = 33065^2 + 5356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121980961 - 2²⁶ = 1054872097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121980967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560990480 + 560990481.

It is an arithmetic number, because the mean of its divisors is an integer number (560990481).

Almost surely, 2^1121980961 is an apocalyptic number.

It is an amenable number.

1121980961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121980961 is an equidigital number, since it uses as much as digits as its factorization.

1121980961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 38.

The square root of 1121980961 is about 33495.9842518473. The cubic root of 1121980961 is about 1039.1107292899.

The spelling of 1121980961 in words is "one billion, one hundred twenty-one million, nine hundred eighty thousand, nine hundred sixty-one".