1128831551 has 4 divisors (see below), whose sum is σ = 1165245504. Its totient is φ = 1092417600.

The previous prime is 1128831547. The next prime is 1128831563. The reversal of 1128831551 is 1551388211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551388211 = 31 ⋅50044781.

It is a cyclic number.

It is not a de Polignac number, because 1128831551 - 2² = 1128831547 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 (1128831511) 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, 18206930 + ... + 18206991.

It is an arithmetic number, because the mean of its divisors is an integer number (291311376).

Almost surely, 2^1128831551 is an apocalyptic number.

1128831551 is a deficient number, since it is larger than the sum of its proper divisors (36413953).

1128831551 is an equidigital number, since it uses as much as digits as its factorization.

1128831551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36413952.

The product of its digits is 9600, while the sum is 35.

The square root of 1128831551 is about 33598.0885021752. The cubic root of 1128831551 is about 1041.2213065270.

The spelling of 1128831551 in words is "one billion, one hundred twenty-eight million, eight hundred thirty-one thousand, five hundred fifty-one".