1191840145 has 8 divisors (see below), whose sum is σ = 1432443240. Its totient is φ = 951982080.

The previous prime is 1191840107. The next prime is 1191840149. The reversal of 1191840145 is 5410481911.

It can be written as a sum of positive squares in 4 ways, for example, as 111534721 + 1080305424 = 10561^2 + 32868^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1191840145 - 2¹⁵ = 1191807377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1191840145.

It is not an unprimeable number, because it can be changed into a prime (1191840149) 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 7 ways as a sum of consecutive naturals, for example, 182730 + ... + 189139.

It is an arithmetic number, because the mean of its divisors is an integer number (179055405).

Almost surely, 2^1191840145 is an apocalyptic number.

It is an amenable number.

1191840145 is a deficient number, since it is larger than the sum of its proper divisors (240603095).

1191840145 is an equidigital number, since it uses as much as digits as its factorization.

1191840145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372515.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 1191840145 is about 34523.0378877642. The cubic root of 1191840145 is about 1060.2444389994.

The spelling of 1191840145 in words is "one billion, one hundred ninety-one million, eight hundred forty thousand, one hundred forty-five".