1011994019 has 4 divisors (see below), whose sum is σ = 1029146520. Its totient is φ = 994841520.

The previous prime is 1011994013. The next prime is 1011994033. The reversal of 1011994019 is 9104991101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1011994019 - 2¹⁶ = 1011928483 is a prime.

It is a super-2 number, since 2×1011994019² = 2048263788983544722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011994019.

It is not an unprimeable number, because it can be changed into a prime (1011994013) 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, 8576162 + ... + 8576279.

It is an arithmetic number, because the mean of its divisors is an integer number (257286630).

Almost surely, 2^1011994019 is an apocalyptic number.

1011994019 is a deficient number, since it is larger than the sum of its proper divisors (17152501).

1011994019 is an equidigital number, since it uses as much as digits as its factorization.

1011994019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17152500.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 1011994019 is about 31811.8534354728. The cubic root of 1011994019 is about 1003.9821279417.

The spelling of 1011994019 in words is "one billion, eleven million, nine hundred ninety-four thousand, nineteen".