145330781 has 2 divisors, whose sum is σ = 145330782. Its totient is φ = 145330780.

The previous prime is 145330777. The next prime is 145330793. The reversal of 145330781 is 187033541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141967225 + 3363556 = 11915^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 145330781 - 2² = 145330777 is a prime.

It is a super-2 number, since 2×145330781² = 42242071812139922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145330771) 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, 72665390 + 72665391.

It is an arithmetic number, because the mean of its divisors is an integer number (72665391).

Almost surely, 2^145330781 is an apocalyptic number.

It is an amenable number.

145330781 is a deficient number, since it is larger than the sum of its proper divisors (1).

145330781 is an equidigital number, since it uses as much as digits as its factorization.

145330781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 145330781 is about 12055.3216879518. The cubic root of 145330781 is about 525.7579751300.

The spelling of 145330781 in words is "one hundred forty-five million, three hundred thirty thousand, seven hundred eighty-one".