1128865875361 has 9 divisors (see below), whose sum is σ = 1313179159761. Its totient is φ = 967592946852.

The previous prime is 1128865875283. The next prime is 1128865875383. The reversal of 1128865875361 is 1635785688211.

It is a happy number.

The square root of 1128865875361 is 1062481.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1128865875361 - 2³¹ = 1126718391713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1128865875361.

It is not an unprimeable number, because it can be changed into a prime (1128865875661) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7361476 + ... + 7513258.

It is an arithmetic number, because the mean of its divisors is an integer number (145908795529).

Almost surely, 2^{1128865875361} is an apocalyptic number.

1128865875361 is the 1062481-st square number.

1128865875361 is the 531241-st centered octagonal number.

It is an amenable number.

1128865875361 is a deficient number, since it is larger than the sum of its proper divisors (184313284400).

1128865875361 is an frugal number, since it uses more digits than its factorization.

1128865875361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303580 (or 151790 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 61.

The spelling of 1128865875361 in words is "one trillion, one hundred twenty-eight billion, eight hundred sixty-five million, eight hundred seventy-five thousand, three hundred sixty-one".