1128212251 has 8 divisors (see below), whose sum is σ = 1169957984. Its totient is φ = 1087058880.

The previous prime is 1128212249. The next prime is 1128212257. The reversal of 1128212251 is 1522128211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1128212251 - 2¹ = 1128212249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128212257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144210 + ... + 151831.

It is an arithmetic number, because the mean of its divisors is an integer number (146244748).

Almost surely, 2^1128212251 is an apocalyptic number.

1128212251 is a deficient number, since it is larger than the sum of its proper divisors (41745733).

1128212251 is a wasteful number, since it uses less digits than its factorization.

1128212251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296181.

The product of its digits is 640, while the sum is 25.

The square root of 1128212251 is about 33588.8709396431. The cubic root of 1128212251 is about 1041.0308599504.

The spelling of 1128212251 in words is "one billion, one hundred twenty-eight million, two hundred twelve thousand, two hundred fifty-one".