145749257 has 2 divisors, whose sum is σ = 145749258. Its totient is φ = 145749256.

The previous prime is 145749239. The next prime is 145749281. The reversal of 145749257 is 752947541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112444816 + 33304441 = 10604^2 + 5771^2 .

It is a cyclic number.

It is not a de Polignac number, because 145749257 - 2⁸ = 145749001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145749287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72874628 + 72874629.

It is an arithmetic number, because the mean of its divisors is an integer number (72874629).

Almost surely, 2^145749257 is an apocalyptic number.

It is an amenable number.

145749257 is a deficient number, since it is larger than the sum of its proper divisors (1).

145749257 is an equidigital number, since it uses as much as digits as its factorization.

145749257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 44.

The square root of 145749257 is about 12072.6656956946. The cubic root of 145749257 is about 526.2621267679.

The spelling of 145749257 in words is "one hundred forty-five million, seven hundred forty-nine thousand, two hundred fifty-seven".