1128312551 has 4 divisors (see below), whose sum is σ = 1134546504. Its totient is φ = 1122078600.

The previous prime is 1128312533. The next prime is 1128312553. The reversal of 1128312551 is 1552138211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128312551 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 (1128312553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3116705 + ... + 3117066.

It is an arithmetic number, because the mean of its divisors is an integer number (283636626).

Almost surely, 2^1128312551 is an apocalyptic number.

1128312551 is a deficient number, since it is larger than the sum of its proper divisors (6233953).

1128312551 is an equidigital number, since it uses as much as digits as its factorization.

1128312551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233952.

The product of its digits is 2400, while the sum is 29.

The square root of 1128312551 is about 33590.3639605170. The cubic root of 1128312551 is about 1041.0617088447.

The spelling of 1128312551 in words is "one billion, one hundred twenty-eight million, three hundred twelve thousand, five hundred fifty-one".