145451785 has 4 divisors (see below), whose sum is σ = 174542148. Its totient is φ = 116361424.

The previous prime is 145451777. The next prime is 145451819. The reversal of 145451785 is 587154541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587154541 = 2273 ⋅258317.

It can be written as a sum of positive squares in 2 ways, for example, as 104530176 + 40921609 = 10224^2 + 6397^2 .

It is a cyclic number.

It is not a de Polignac number, because 145451785 - 2³ = 145451777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14545174 + ... + 14545183.

It is an arithmetic number, because the mean of its divisors is an integer number (43635537).

Almost surely, 2^145451785 is an apocalyptic number.

It is an amenable number.

145451785 is a deficient number, since it is larger than the sum of its proper divisors (29090363).

145451785 is an equidigital number, since it uses as much as digits as its factorization.

145451785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29090362.

The product of its digits is 112000, while the sum is 40.

The square root of 145451785 is about 12060.3393401678. The cubic root of 145451785 is about 525.9038519341.

The spelling of 145451785 in words is "one hundred forty-five million, four hundred fifty-one thousand, seven hundred eighty-five".