145209941 has 4 divisors (see below), whose sum is σ = 149134572. Its totient is φ = 141285312.

The previous prime is 145209863. The next prime is 145210003. The reversal of 145209941 is 149902541.

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 100600900 + 44609041 = 10030^2 + 6679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145209941 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 (145209041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962260 + ... + 1962333.

It is an arithmetic number, because the mean of its divisors is an integer number (37283643).

Almost surely, 2^145209941 is an apocalyptic number.

It is an amenable number.

145209941 is a deficient number, since it is larger than the sum of its proper divisors (3924631).

145209941 is an equidigital number, since it uses as much as digits as its factorization.

145209941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924630.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 145209941 is about 12050.3087512312. The cubic root of 145209941 is about 525.6122152064.

The spelling of 145209941 in words is "one hundred forty-five million, two hundred nine thousand, nine hundred forty-one".