11191945 has 8 divisors (see below), whose sum is σ = 13793544. Its totient is φ = 8711424.

The previous prime is 11191937. The next prime is 11191951. The reversal of 11191945 is 54919111.

It can be written as a sum of positive squares in 4 ways, for example, as 5934096 + 5257849 = 2436^2 + 2293^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11191945 - 2³ = 11191937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 30064 + ... + 30433.

It is an arithmetic number, because the mean of its divisors is an integer number (1724193).

Almost surely, 2^11191945 is an apocalyptic number.

It is an amenable number.

11191945 is a deficient number, since it is larger than the sum of its proper divisors (2601599).

11191945 is an equidigital number, since it uses as much as digits as its factorization.

11191945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60539.

The product of its digits is 1620, while the sum is 31.

The square root of 11191945 is about 3345.4364438740. The cubic root of 11191945 is about 223.6841384131.

The spelling of 11191945 in words is "eleven million, one hundred ninety-one thousand, nine hundred forty-five".