1011105491 has 4 divisors (see below), whose sum is σ = 1103024184. Its totient is φ = 919186800.

The previous prime is 1011105467. The next prime is 1011105521. The reversal of 1011105491 is 1945011101.

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 1011105491 - 2⁶ = 1011105427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011005491) 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, 45959330 + ... + 45959351.

It is an arithmetic number, because the mean of its divisors is an integer number (275756046).

Almost surely, 2^1011105491 is an apocalyptic number.

1011105491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011105491 is a deficient number, since it is larger than the sum of its proper divisors (91918693).

1011105491 is an equidigital number, since it uses as much as digits as its factorization.

1011105491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91918692.

The product of its (nonzero) digits is 180, while the sum is 23.

The square root of 1011105491 is about 31797.8850082832. The cubic root of 1011105491 is about 1003.6882107116.

Adding to 1011105491 its reverse (1945011101), we get a palindrome (2956116592).

It can be divided in two parts, 101110 and 5491, that added together give a palindrome (106601).

The spelling of 1011105491 in words is "one billion, eleven million, one hundred five thousand, four hundred ninety-one".