1011121989 has 4 divisors (see below), whose sum is σ = 1348162656. Its totient is φ = 674081324.

The previous prime is 1011121987. The next prime is 1011121997. The reversal of 1011121989 is 9891211101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011121989 - 2¹ = 1011121987 is a prime.

It is a super-2 number, since 2×1011121989² = 2044735353278632242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011121981) 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, 168520329 + ... + 168520334.

It is an arithmetic number, because the mean of its divisors is an integer number (337040664).

Almost surely, 2^1011121989 is an apocalyptic number.

It is an amenable number.

1011121989 is a deficient number, since it is larger than the sum of its proper divisors (337040667).

1011121989 is an equidigital number, since it uses as much as digits as its factorization.

1011121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337040666.

The product of its (nonzero) digits is 1296, while the sum is 33.

The square root of 1011121989 is about 31798.1444269945. The cubic root of 1011121989 is about 1003.6936696732.

The spelling of 1011121989 in words is "one billion, eleven million, one hundred twenty-one thousand, nine hundred eighty-nine".