1128628461 has 4 divisors (see below), whose sum is σ = 1504837952. Its totient is φ = 752418972.

The previous prime is 1128628451. The next prime is 1128628471. The reversal of 1128628461 is 1648268211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1648268211 = 3 ⋅549422737.

It is an interprime number because it is at equal distance from previous prime (1128628451) and next prime (1128628471).

It is not a de Polignac number, because 1128628461 - 2⁵ = 1128628429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128628451) 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 in 3 ways as a sum of consecutive naturals, for example, 188104741 + ... + 188104746.

It is an arithmetic number, because the mean of its divisors is an integer number (376209488).

Almost surely, 2^1128628461 is an apocalyptic number.

It is an amenable number.

1128628461 is a deficient number, since it is larger than the sum of its proper divisors (376209491).

1128628461 is an equidigital number, since it uses as much as digits as its factorization.

1128628461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376209490.

The product of its digits is 36864, while the sum is 39.

The square root of 1128628461 is about 33595.0660216646. The cubic root of 1128628461 is about 1041.1588601511.

The spelling of 1128628461 in words is "one billion, one hundred twenty-eight million, six hundred twenty-eight thousand, four hundred sixty-one".