145942189 has 2 divisors, whose sum is σ = 145942190. Its totient is φ = 145942188.

The previous prime is 145942117. The next prime is 145942201. The reversal of 145942189 is 981249541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95062500 + 50879689 = 9750^2 + 7133^2 .

It is a cyclic number.

It is not a de Polignac number, because 145942189 - 2²⁵ = 112387757 is a prime.

It is a super-2 number, since 2×145942189² = 42598245060223442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145942109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72971094 + 72971095.

It is an arithmetic number, because the mean of its divisors is an integer number (72971095).

Almost surely, 2^145942189 is an apocalyptic number.

It is an amenable number.

145942189 is a deficient number, since it is larger than the sum of its proper divisors (1).

145942189 is an equidigital number, since it uses as much as digits as its factorization.

145942189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 145942189 is about 12080.6535005355. The cubic root of 145942189 is about 526.4942332388.

The spelling of 145942189 in words is "one hundred forty-five million, nine hundred forty-two thousand, one hundred eighty-nine".