1145943091 has 4 divisors (see below), whose sum is σ = 1185458400. Its totient is φ = 1106427784.

The previous prime is 1145943079. The next prime is 1145943103. The reversal of 1145943091 is 1903495411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1903495411 = 19 ⋅100183969.

It is an interprime number because it is at equal distance from previous prime (1145943079) and next prime (1145943103).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145943091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1145943091.

It is not an unprimeable number, because it can be changed into a prime (1145943791) 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, 19757611 + ... + 19757668.

It is an arithmetic number, because the mean of its divisors is an integer number (296364600).

Almost surely, 2^1145943091 is an apocalyptic number.

1145943091 is a deficient number, since it is larger than the sum of its proper divisors (39515309).

1145943091 is an equidigital number, since it uses as much as digits as its factorization.

1145943091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39515308.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1145943091 is about 33851.7812086750. The cubic root of 1145943091 is about 1046.4561070598.

The spelling of 1145943091 in words is "one billion, one hundred forty-five million, nine hundred forty-three thousand, ninety-one".