1645112147 has 4 divisors (see below), whose sum is σ = 1880128176. Its totient is φ = 1410096120.

The previous prime is 1645112137. The next prime is 1645112149. The reversal of 1645112147 is 7412115461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7412115461 = 17419 ⋅425519.

It is a cyclic number.

It is not a de Polignac number, because 1645112147 - 2¹⁰ = 1645111123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645112149) 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, 117508004 + ... + 117508017.

It is an arithmetic number, because the mean of its divisors is an integer number (470032044).

Almost surely, 2^1645112147 is an apocalyptic number.

1645112147 is a deficient number, since it is larger than the sum of its proper divisors (235016029).

1645112147 is an equidigital number, since it uses as much as digits as its factorization.

1645112147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235016028.

The product of its digits is 6720, while the sum is 32.

The square root of 1645112147 is about 40559.9820882603. The cubic root of 1645112147 is about 1180.4977663904.

The spelling of 1645112147 in words is "one billion, six hundred forty-five million, one hundred twelve thousand, one hundred forty-seven".