145447901 has 4 divisors (see below), whose sum is σ = 147440412. Its totient is φ = 143455392.

The previous prime is 145447879. The next prime is 145447909. The reversal of 145447901 is 109744541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109744541 = 6163 ⋅17807.

It can be written as a sum of positive squares in 2 ways, for example, as 69322276 + 76125625 = 8326^2 + 8725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145447901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145447909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996146 + ... + 996291.

It is an arithmetic number, because the mean of its divisors is an integer number (36860103).

Almost surely, 2^145447901 is an apocalyptic number.

It is an amenable number.

145447901 is a deficient number, since it is larger than the sum of its proper divisors (1992511).

145447901 is an equidigital number, since it uses as much as digits as its factorization.

145447901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992510.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 145447901 is about 12060.1783154313. The cubic root of 145447901 is about 525.8991708210.

The spelling of 145447901 in words is "one hundred forty-five million, four hundred forty-seven thousand, nine hundred one".