1128629869 has 4 divisors (see below), whose sum is σ = 1147132060. Its totient is φ = 1110127680.

The previous prime is 1128629867. The next prime is 1128629897. The reversal of 1128629869 is 9689268211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10530025 + 1118099844 = 3245^2 + 33438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128629869 - 2¹ = 1128629867 is a prime.

It is a super-2 number, since 2×1128629869² = 2547610762397914322, 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 (1128629863) 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, 9251004 + ... + 9251125.

It is an arithmetic number, because the mean of its divisors is an integer number (286783015).

Almost surely, 2^1128629869 is an apocalyptic number.

It is an amenable number.

1128629869 is a deficient number, since it is larger than the sum of its proper divisors (18502191).

1128629869 is an equidigital number, since it uses as much as digits as its factorization.

1128629869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18502190.

The product of its digits is 746496, while the sum is 52.

The square root of 1128629869 is about 33595.0869771162. The cubic root of 1128629869 is about 1041.1592931106.

The spelling of 1128629869 in words is "one billion, one hundred twenty-eight million, six hundred twenty-nine thousand, eight hundred sixty-nine".