1091101920187 has 2 divisors, whose sum is σ = 1091101920188. Its totient is φ = 1091101920186.

The previous prime is 1091101920157. The next prime is 1091101920269. The reversal of 1091101920187 is 7810291011901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091101920187 - 2⁷ = 1091101920059 is a prime.

It is a super-2 number, since 2×1091101920187² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1091101920127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545550960093 + 545550960094.

It is an arithmetic number, because the mean of its divisors is an integer number (545550960094).

Almost surely, 2^{1091101920187} is an apocalyptic number.

1091101920187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091101920187 is an equidigital number, since it uses as much as digits as its factorization.

1091101920187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 40.

The spelling of 1091101920187 in words is "one trillion, ninety-one billion, one hundred one million, nine hundred twenty thousand, one hundred eighty-seven".