145267781 has 2 divisors, whose sum is σ = 145267782. Its totient is φ = 145267780.

The previous prime is 145267769. The next prime is 145267817. The reversal of 145267781 is 187762541.

Together with next prime (145267817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129026881 + 16240900 = 11359^2 + 4030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145267781 is a prime.

It is a super-2 number, since 2×145267781² = 42205456393327922, 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 (145267721) 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, 72633890 + 72633891.

It is an arithmetic number, because the mean of its divisors is an integer number (72633891).

Almost surely, 2^145267781 is an apocalyptic number.

It is an amenable number.

145267781 is a deficient number, since it is larger than the sum of its proper divisors (1).

145267781 is an equidigital number, since it uses as much as digits as its factorization.

145267781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 145267781 is about 12052.7084508006. The cubic root of 145267781 is about 525.6819931998.

The spelling of 145267781 in words is "one hundred forty-five million, two hundred sixty-seven thousand, seven hundred eighty-one".