1091373093091 has 4 divisors (see below), whose sum is σ = 1095256983384. Its totient is φ = 1087489202800.

The previous prime is 1091373093079. The next prime is 1091373093103. The reversal of 1091373093091 is 1903903731901.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1091373093079) and next prime (1091373093103).

It is a cyclic number.

It is not a de Polignac number, because 1091373093091 - 2⁵ = 1091373093059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091373093011) 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, 1941944725 + ... + 1941945286.

It is an arithmetic number, because the mean of its divisors is an integer number (273814245846).

Almost surely, 2^{1091373093091} is an apocalyptic number.

1091373093091 is a deficient number, since it is larger than the sum of its proper divisors (3883890293).

1091373093091 is an equidigital number, since it uses as much as digits as its factorization.

1091373093091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883890292.

The product of its (nonzero) digits is 137781, while the sum is 46.

The spelling of 1091373093091 in words is "one trillion, ninety-one billion, three hundred seventy-three million, ninety-three thousand, ninety-one".