145044401 has 4 divisors (see below), whose sum is σ = 145087332. Its totient is φ = 145001472.

The previous prime is 145044377. The next prime is 145044421. The reversal of 145044401 is 104440541.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8271376 + 136773025 = 2876^2 + 11695^2 .

It is a cyclic number.

It is not a de Polignac number, because 145044401 - 2⁶ = 145044337 is a prime.

It is a super-2 number, since 2×145044401² = 42075756522897602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145044421) by changing a digit.

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, 15920 + ... + 23313.

It is an arithmetic number, because the mean of its divisors is an integer number (36271833).

Almost surely, 2^145044401 is an apocalyptic number.

It is an amenable number.

145044401 is a deficient number, since it is larger than the sum of its proper divisors (42931).

145044401 is an equidigital number, since it uses as much as digits as its factorization.

145044401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42930.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 145044401 is about 12043.4380888515. The cubic root of 145044401 is about 525.4124058124.

Adding to 145044401 its reverse (104440541), we get a palindrome (249484942).

The spelling of 145044401 in words is "one hundred forty-five million, forty-four thousand, four hundred one".