257825803 has 2 divisors, whose sum is σ = 257825804. Its totient is φ = 257825802.

The previous prime is 257825797. The next prime is 257825819. The reversal of 257825803 is 308528752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257825803 is a prime.

It is not a weakly prime, because it can be changed into another prime (257825203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128912901 + 128912902.

It is an arithmetic number, because the mean of its divisors is an integer number (128912902).

Almost surely, 2^257825803 is an apocalyptic number.

257825803 is a deficient number, since it is larger than the sum of its proper divisors (1).

257825803 is an equidigital number, since it uses as much as digits as its factorization.

257825803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 257825803 is about 16056.9549728459. The cubic root of 257825803 is about 636.4663679495.

The spelling of 257825803 in words is "two hundred fifty-seven million, eight hundred twenty-five thousand, eight hundred three".