145941409 has 2 divisors, whose sum is σ = 145941410. Its totient is φ = 145941408.

The previous prime is 145941407. The next prime is 145941437. The reversal of 145941409 is 904149541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139830625 + 6110784 = 11825^2 + 2472^2 .

It is an emirp because it is prime and its reverse (904149541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145941409 - 2¹ = 145941407 is a prime.

Together with 145941407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145941401) 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 as a sum of consecutive naturals, namely, 72970704 + 72970705.

It is an arithmetic number, because the mean of its divisors is an integer number (72970705).

Almost surely, 2^145941409 is an apocalyptic number.

It is an amenable number.

145941409 is a deficient number, since it is larger than the sum of its proper divisors (1).

145941409 is an equidigital number, since it uses as much as digits as its factorization.

145941409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 145941409 is about 12080.6212174706. The cubic root of 145941409 is about 526.4932952733.

The spelling of 145941409 in words is "one hundred forty-five million, nine hundred forty-one thousand, four hundred nine".