145403281 has 2 divisors, whose sum is σ = 145403282. Its totient is φ = 145403280.

The previous prime is 145403239. The next prime is 145403287. The reversal of 145403281 is 182304541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78163281 + 67240000 = 8841^2 + 8200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145403281 is a prime.

It is a super-2 number, since 2×145403281² = 42284228251129922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145403287) 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, 72701640 + 72701641.

It is an arithmetic number, because the mean of its divisors is an integer number (72701641).

Almost surely, 2^145403281 is an apocalyptic number.

It is an amenable number.

145403281 is a deficient number, since it is larger than the sum of its proper divisors (1).

145403281 is an equidigital number, since it uses as much as digits as its factorization.

145403281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 145403281 is about 12058.3282838045. The cubic root of 145403281 is about 525.8453874828.

The spelling of 145403281 in words is "one hundred forty-five million, four hundred three thousand, two hundred eighty-one".