1019121011 has 4 divisors (see below), whose sum is σ = 1019373024. Its totient is φ = 1018869000.

The previous prime is 1019120951. The next prime is 1019121017. The reversal of 1019121011 is 1101219101.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1019121011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1019121017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119840 + ... + 128061.

It is an arithmetic number, because the mean of its divisors is an integer number (254843256).

Almost surely, 2^1019121011 is an apocalyptic number.

1019121011 is a deficient number, since it is larger than the sum of its proper divisors (252013).

1019121011 is an equidigital number, since it uses as much as digits as its factorization.

1019121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252012.

The product of its (nonzero) digits is 18, while the sum is 17.

The square root of 1019121011 is about 31923.6747728077. The cubic root of 1019121011 is about 1006.3334727714. Note that the first 3 decimals are identical.

The spelling of 1019121011 in words is "one billion, nineteen million, one hundred twenty-one thousand, eleven".