145197389 has 2 divisors, whose sum is σ = 145197390. Its totient is φ = 145197388.

The previous prime is 145197379. The next prime is 145197433. The reversal of 145197389 is 983791541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82264900 + 62932489 = 9070^2 + 7933^2 .

It is a cyclic number.

It is not a de Polignac number, because 145197389 - 2²⁰ = 144148813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145197379) 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, 72598694 + 72598695.

It is an arithmetic number, because the mean of its divisors is an integer number (72598695).

Almost surely, 2^145197389 is an apocalyptic number.

It is an amenable number.

145197389 is a deficient number, since it is larger than the sum of its proper divisors (1).

145197389 is an equidigital number, since it uses as much as digits as its factorization.

145197389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 145197389 is about 12049.7879234450. The cubic root of 145197389 is about 525.5970700665.

The spelling of 145197389 in words is "one hundred forty-five million, one hundred ninety-seven thousand, three hundred eighty-nine".