257261803 has 2 divisors, whose sum is σ = 257261804. Its totient is φ = 257261802.

The previous prime is 257261779. The next prime is 257261821. The reversal of 257261803 is 308162752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257261803 - 2¹³ = 257253611 is a prime.

It is not a weakly prime, because it can be changed into another prime (257261863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128630901 + 128630902.

It is an arithmetic number, because the mean of its divisors is an integer number (128630902).

Almost surely, 2^257261803 is an apocalyptic number.

257261803 is a deficient number, since it is larger than the sum of its proper divisors (1).

257261803 is an equidigital number, since it uses as much as digits as its factorization.

257261803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 257261803 is about 16039.3828746620. The cubic root of 257261803 is about 636.0019340882.

It can be divided in two parts, 257261 and 803, that added together give a square (258064 = 508²).

The spelling of 257261803 in words is "two hundred fifty-seven million, two hundred sixty-one thousand, eight hundred three".