1011111993 has 24 divisors (see below), whose sum is σ = 1535002560. Its totient is φ = 640110240.

The previous prime is 1011111991. The next prime is 1011112049. The reversal of 1011111993 is 3991111101.

It is not a de Polignac number, because 1011111993 - 2¹ = 1011111991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011111991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11203 + ... + 46343.

It is an arithmetic number, because the mean of its divisors is an integer number (63958440).

Almost surely, 2^1011111993 is an apocalyptic number.

It is an amenable number.

1011111993 is a deficient number, since it is larger than the sum of its proper divisors (523890567).

1011111993 is a wasteful number, since it uses less digits than its factorization.

1011111993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35309 (or 35306 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 27.

The square root of 1011111993 is about 31797.9872476231. The cubic root of 1011111993 is about 1003.6903621412.

The spelling of 1011111993 in words is "one billion, eleven million, one hundred eleven thousand, nine hundred ninety-three".