145791809 has 8 divisors (see below), whose sum is σ = 148254720. Its totient is φ = 143349696.

The previous prime is 145791797. The next prime is 145791827. The reversal of 145791809 is 908197541.

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 145791809 - 2⁸ = 145791553 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145791809.

It is not an unprimeable number, because it can be changed into a prime (145791839) 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, 9272 + ... + 19430.

It is an arithmetic number, because the mean of its divisors is an integer number (18531840).

Almost surely, 2^145791809 is an apocalyptic number.

It is an amenable number.

145791809 is a deficient number, since it is larger than the sum of its proper divisors (2462911).

145791809 is a wasteful number, since it uses less digits than its factorization.

145791809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10399.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 145791809 is about 12074.4278953497. The cubic root of 145791809 is about 526.3133364677.

The spelling of 145791809 in words is "one hundred forty-five million, seven hundred ninety-one thousand, eight hundred nine".