257005145 has 8 divisors (see below), whose sum is σ = 316741704. Its totient is φ = 200047104.

The previous prime is 257005141. The next prime is 257005181. The reversal of 257005145 is 541500752.

It can be written as a sum of positive squares in 4 ways, for example, as 151388416 + 105616729 = 12304^2 + 10277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257005145 - 2² = 257005141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257005141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694424 + ... + 694793.

It is an arithmetic number, because the mean of its divisors is an integer number (39592713).

Almost surely, 2^257005145 is an apocalyptic number.

It is an amenable number.

257005145 is a deficient number, since it is larger than the sum of its proper divisors (59736559).

257005145 is a wasteful number, since it uses less digits than its factorization.

257005145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389259.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 257005145 is about 16031.3800092194. The cubic root of 257005145 is about 635.7903606424.

Adding to 257005145 its reverse (541500752), we get a palindrome (798505897).

The spelling of 257005145 in words is "two hundred fifty-seven million, five thousand, one hundred forty-five".