1128310621 has 6 divisors (see below), whose sum is σ = 1198586330. Its totient is φ = 1061939136.

The previous prime is 1128310567. The next prime is 1128310633. The reversal of 1128310621 is 1260138211.

It can be written as a sum of positive squares in 3 ways, for example, as 480048100 + 648262521 = 21910^2 + 25461^2 .

It is not a de Polignac number, because 1128310621 - 2⁹ = 1128310109 is a prime.

It is a super-2 number, since 2×1128310621² = 2546169714922811282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128310681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1951806 + ... + 1952383.

Almost surely, 2^1128310621 is an apocalyptic number.

It is an amenable number.

1128310621 is a deficient number, since it is larger than the sum of its proper divisors (70275709).

1128310621 is an equidigital number, since it uses as much as digits as its factorization.

1128310621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904223 (or 3904206 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1128310621 is about 33590.3352320277. The cubic root of 1128310621 is about 1041.0611152591.

Adding to 1128310621 its reverse (1260138211), we get a palindrome (2388448832).

It can be divided in two parts, 11283 and 10621, that added together give a square (21904 = 148²).

The spelling of 1128310621 in words is "one billion, one hundred twenty-eight million, three hundred ten thousand, six hundred twenty-one".