1011101055991 has 4 divisors (see below), whose sum is σ = 1088878060312. Its totient is φ = 933324051672.

The previous prime is 1011101055973. The next prime is 1011101056001. The reversal of 1011101055991 is 1995501011101.

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 1011101055991 - 2⁵ = 1011101055959 is a prime.

It is a super-2 number, since 2×1011101055991² (a number of 25 digits) 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 (1011101055191) 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, 38888502141 + ... + 38888502166.

It is an arithmetic number, because the mean of its divisors is an integer number (272219515078).

Almost surely, 2^{1011101055991} is an apocalyptic number.

1011101055991 is a deficient number, since it is larger than the sum of its proper divisors (77777004321).

1011101055991 is an equidigital number, since it uses as much as digits as its factorization.

1011101055991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77777004320.

The product of its (nonzero) digits is 2025, while the sum is 34.

The spelling of 1011101055991 in words is "one trillion, eleven billion, one hundred one million, fifty-five thousand, nine hundred ninety-one".