145278257 has 2 divisors, whose sum is σ = 145278258. Its totient is φ = 145278256.

The previous prime is 145278253. The next prime is 145278319. The reversal of 145278257 is 752872541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145178401 + 99856 = 12049^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 145278257 - 2² = 145278253 is a prime.

It is a super-2 number, since 2×145278257² = 42211543913916098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145278253) 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, 72639128 + 72639129.

It is an arithmetic number, because the mean of its divisors is an integer number (72639129).

Almost surely, 2^145278257 is an apocalyptic number.

It is an amenable number.

145278257 is a deficient number, since it is larger than the sum of its proper divisors (1).

145278257 is an equidigital number, since it uses as much as digits as its factorization.

145278257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 41.

The square root of 145278257 is about 12053.1430340804. The cubic root of 145278257 is about 525.6946294319.

The spelling of 145278257 in words is "one hundred forty-five million, two hundred seventy-eight thousand, two hundred fifty-seven".