145311281 has 2 divisors, whose sum is σ = 145311282. Its totient is φ = 145311280.

The previous prime is 145311203. The next prime is 145311289. The reversal of 145311281 is 182113541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134189056 + 11122225 = 11584^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 145311281 - 2¹⁰ = 145310257 is a prime.

It is a super-2 number, since 2×145311281² = 42230736771721922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145311281.

It is not a weakly prime, because it can be changed into another prime (145311289) 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, 72655640 + 72655641.

It is an arithmetic number, because the mean of its divisors is an integer number (72655641).

Almost surely, 2^145311281 is an apocalyptic number.

It is an amenable number.

145311281 is a deficient number, since it is larger than the sum of its proper divisors (1).

145311281 is an equidigital number, since it uses as much as digits as its factorization.

145311281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 145311281 is about 12054.5128893705. The cubic root of 145311281 is about 525.7344592604.

The spelling of 145311281 in words is "one hundred forty-five million, three hundred eleven thousand, two hundred eighty-one".