257235105 has 16 divisors (see below), whose sum is σ = 429471360. Its totient is φ = 131227008.

The previous prime is 257235101. The next prime is 257235113. The reversal of 257235105 is 501532752.

It is not a de Polignac number, because 257235105 - 2² = 257235101 is a prime.

It is a super-2 number, since 2×257235105² = 132339798488722050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257235101) 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 in 15 ways as a sum of consecutive naturals, for example, 372460 + ... + 373149.

It is an arithmetic number, because the mean of its divisors is an integer number (26841960).

Almost surely, 2^257235105 is an apocalyptic number.

It is an amenable number.

257235105 is a deficient number, since it is larger than the sum of its proper divisors (172236255).

257235105 is a wasteful number, since it uses less digits than its factorization.

257235105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745640.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 257235105 is about 16038.5505891274. The cubic root of 257235105 is about 635.9799324193.

Adding to 257235105 its reverse (501532752), we get a palindrome (758767857).

The spelling of 257235105 in words is "two hundred fifty-seven million, two hundred thirty-five thousand, one hundred five".