145511281 has 2 divisors, whose sum is σ = 145511282. Its totient is φ = 145511280.

The previous prime is 145511273. The next prime is 145511309. The reversal of 145511281 is 182115541.

It is an a-pointer prime, because the next prime (145511309) can be obtained adding 145511281 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104346225 + 41165056 = 10215^2 + 6416^2 .

It is a cyclic number.

It is not a de Polignac number, because 145511281 - 2³ = 145511273 is a prime.

It is a super-2 number, since 2×145511281² = 42347065796521922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145511081) 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, 72755640 + 72755641.

It is an arithmetic number, because the mean of its divisors is an integer number (72755641).

Almost surely, 2^145511281 is an apocalyptic number.

It is an amenable number.

145511281 is a deficient number, since it is larger than the sum of its proper divisors (1).

145511281 is an equidigital number, since it uses as much as digits as its factorization.

145511281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 28.

The square root of 145511281 is about 12062.8056852459. The cubic root of 145511281 is about 525.9755478809.

The spelling of 145511281 in words is "one hundred forty-five million, five hundred eleven thousand, two hundred eighty-one".