145789381 has 2 divisors, whose sum is σ = 145789382. Its totient is φ = 145789380.

The previous prime is 145789313. The next prime is 145789403. The reversal of 145789381 is 183987541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 2149156 = 11985^2 + 1466^2 .

It is a cyclic number.

It is not a de Polignac number, because 145789381 - 2⁹ = 145788869 is a prime.

It is a super-2 number, since 2×145789381² = 42509087224726322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145781381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72894690 + 72894691.

It is an arithmetic number, because the mean of its divisors is an integer number (72894691).

Almost surely, 2^145789381 is an apocalyptic number.

It is an amenable number.

145789381 is a deficient number, since it is larger than the sum of its proper divisors (1).

145789381 is an equidigital number, since it uses as much as digits as its factorization.

145789381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 145789381 is about 12074.3273518652. The cubic root of 145789381 is about 526.3104147309.

The spelling of 145789381 in words is "one hundred forty-five million, seven hundred eighty-nine thousand, three hundred eighty-one".