1646131145 has 4 divisors (see below), whose sum is σ = 1975357380. Its totient is φ = 1316904912.

The previous prime is 1646131141. The next prime is 1646131159. The reversal of 1646131145 is 5411316461.

1646131145 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5411316461 = 17 ⋅318312733.

It can be written as a sum of positive squares in 2 ways, for example, as 1225840144 + 420291001 = 35012^2 + 20501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646131145 - 2² = 1646131141 is a prime.

It is a super-2 number, since 2×1646131145² = 5419495493078022050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1646131141) 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, 164613110 + ... + 164613119.

It is an arithmetic number, because the mean of its divisors is an integer number (493839345).

Almost surely, 2^1646131145 is an apocalyptic number.

It is an amenable number.

1646131145 is a deficient number, since it is larger than the sum of its proper divisors (329226235).

1646131145 is an equidigital number, since it uses as much as digits as its factorization.

1646131145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329226234.

The product of its digits is 8640, while the sum is 32.

The square root of 1646131145 is about 40572.5417616397. The cubic root of 1646131145 is about 1180.7414532383.

The spelling of 1646131145 in words is "one billion, six hundred forty-six million, one hundred thirty-one thousand, one hundred forty-five".