1011985079 has 4 divisors (see below), whose sum is σ = 1156554384. Its totient is φ = 867415776.

The previous prime is 1011985067. The next prime is 1011985099. The reversal of 1011985079 is 9705891101.

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-1011985079 is a prime.

It is a super-2 number, since 2×1011985079² = 2048227600237272482, 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 (1011985099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72284642 + ... + 72284655.

It is an arithmetic number, because the mean of its divisors is an integer number (289138596).

Almost surely, 2^1011985079 is an apocalyptic number.

1011985079 is a deficient number, since it is larger than the sum of its proper divisors (144569305).

1011985079 is an equidigital number, since it uses as much as digits as its factorization.

1011985079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144569304.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 1011985079 is about 31811.7129215011. The cubic root of 1011985079 is about 1003.9791715255.

The spelling of 1011985079 in words is "one billion, eleven million, nine hundred eighty-five thousand, seventy-nine".