1011129989 has 4 divisors (see below), whose sum is σ = 1020078156. Its totient is φ = 1002181824.

The previous prime is 1011129983. The next prime is 1011130013. The reversal of 1011129989 is 9899211101.

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 73239364 + 937890625 = 8558^2 + 30625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011129989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011129983) 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, 4473914 + ... + 4474139.

It is an arithmetic number, because the mean of its divisors is an integer number (255019539).

Almost surely, 2^1011129989 is an apocalyptic number.

It is an amenable number.

1011129989 is a deficient number, since it is larger than the sum of its proper divisors (8948167).

1011129989 is an equidigital number, since it uses as much as digits as its factorization.

1011129989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8948166.

The product of its (nonzero) digits is 11664, while the sum is 41.

The square root of 1011129989 is about 31798.2702202494. The cubic root of 1011129989 is about 1003.6963167419.

The spelling of 1011129989 in words is "one billion, eleven million, one hundred twenty-nine thousand, nine hundred eighty-nine".