1091060091 has 32 divisors (see below), whose sum is σ = 1792266240. Its totient is φ = 650397600.

The previous prime is 1091060081. The next prime is 1091060129. The reversal of 1091060091 is 1900601901.

It is not a de Polignac number, because 1091060091 - 2⁵ = 1091060059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1091060071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11995 + ... + 48228.

It is an arithmetic number, because the mean of its divisors is an integer number (56008320).

Almost surely, 2^1091060091 is an apocalyptic number.

1091060091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1091060091 is a deficient number, since it is larger than the sum of its proper divisors (701206149).

1091060091 is a wasteful number, since it uses less digits than its factorization.

1091060091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60304 (or 60298 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 1091060091 is about 33031.1987520889. The cubic root of 1091060091 is about 1029.4759929246.

Adding to 1091060091 its reverse (1900601901), we get a palindrome (2991661992).

The spelling of 1091060091 in words is "one billion, ninety-one million, sixty thousand, ninety-one".