145891181 has 2 divisors, whose sum is σ = 145891182. Its totient is φ = 145891180.

The previous prime is 145891171. The next prime is 145891223. The reversal of 145891181 is 181198541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143185156 + 2706025 = 11966^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 145891181 - 2¹⁸ = 145629037 is a prime.

It is a super-2 number, since 2×145891181² = 42568473387149522, 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 (145891121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72945590 + 72945591.

It is an arithmetic number, because the mean of its divisors is an integer number (72945591).

Almost surely, 2^145891181 is an apocalyptic number.

It is an amenable number.

145891181 is a deficient number, since it is larger than the sum of its proper divisors (1).

145891181 is an equidigital number, since it uses as much as digits as its factorization.

145891181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 38.

The square root of 145891181 is about 12078.5421719676. The cubic root of 145891181 is about 526.4328880642.

The spelling of 145891181 in words is "one hundred forty-five million, eight hundred ninety-one thousand, one hundred eighty-one".