145505257 has 2 divisors, whose sum is σ = 145505258. Its totient is φ = 145505256.

The previous prime is 145505231. The next prime is 145505273. The reversal of 145505257 is 752505541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97397161 + 48108096 = 9869^2 + 6936^2 .

It is an emirp because it is prime and its reverse (752505541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145505257 - 2¹¹ = 145503209 is a prime.

It is not a weakly prime, because it can be changed into another prime (145505207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72752628 + 72752629.

It is an arithmetic number, because the mean of its divisors is an integer number (72752629).

Almost surely, 2^145505257 is an apocalyptic number.

It is an amenable number.

145505257 is a deficient number, since it is larger than the sum of its proper divisors (1).

145505257 is an equidigital number, since it uses as much as digits as its factorization.

145505257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35000, while the sum is 34.

The square root of 145505257 is about 12062.5559895074. Note that the first 3 decimals coincide. The cubic root of 145505257 is about 525.9682895195.

The spelling of 145505257 in words is "one hundred forty-five million, five hundred five thousand, two hundred fifty-seven".