145194389 has 2 divisors, whose sum is σ = 145194390. Its totient is φ = 145194388.

The previous prime is 145194373. The next prime is 145194397. The reversal of 145194389 is 983491541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 61105489 = 9170^2 + 7817^2 .

It is an emirp because it is prime and its reverse (983491541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145194389 - 2⁴ = 145194373 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145194089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72597194 + 72597195.

It is an arithmetic number, because the mean of its divisors is an integer number (72597195).

Almost surely, 2^145194389 is an apocalyptic number.

It is an amenable number.

145194389 is a deficient number, since it is larger than the sum of its proper divisors (1).

145194389 is an equidigital number, since it uses as much as digits as its factorization.

145194389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 145194389 is about 12049.6634392833. The cubic root of 145194389 is about 525.5934501619.

The spelling of 145194389 in words is "one hundred forty-five million, one hundred ninety-four thousand, three hundred eighty-nine".