257533109 has 2 divisors, whose sum is σ = 257533110. Its totient is φ = 257533108.

The previous prime is 257533099. The next prime is 257533219. The reversal of 257533109 is 901335752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185232100 + 72301009 = 13610^2 + 8503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257533109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257533009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128766554 + 128766555.

It is an arithmetic number, because the mean of its divisors is an integer number (128766555).

Almost surely, 2^257533109 is an apocalyptic number.

It is an amenable number.

257533109 is a deficient number, since it is larger than the sum of its proper divisors (1).

257533109 is an equidigital number, since it uses as much as digits as its factorization.

257533109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 257533109 is about 16047.8381410083. The cubic root of 257533109 is about 636.2254295279.

The spelling of 257533109 in words is "two hundred fifty-seven million, five hundred thirty-three thousand, one hundred nine".