1128377521 has 2 divisors, whose sum is σ = 1128377522. Its totient is φ = 1128377520.

The previous prime is 1128377519. The next prime is 1128377543. The reversal of 1128377521 is 1257738211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121513121 + 6864400 = 33489^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128377521 - 2¹ = 1128377519 is a prime.

Together with 1128377519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1128377581) 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, 564188760 + 564188761.

It is an arithmetic number, because the mean of its divisors is an integer number (564188761).

Almost surely, 2^1128377521 is an apocalyptic number.

It is an amenable number.

1128377521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128377521 is an equidigital number, since it uses as much as digits as its factorization.

1128377521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 37.

The square root of 1128377521 is about 33591.3310394215. The cubic root of 1128377521 is about 1041.0816904478.

It can be divided in two parts, 112837752 and 1, that added together give a triangular number (112837753 = T₁₅₀₂₂).

The spelling of 1128377521 in words is "one billion, one hundred twenty-eight million, three hundred seventy-seven thousand, five hundred twenty-one".