257069409 has 4 divisors (see below), whose sum is σ = 342759216. Its totient is φ = 171379604.

The previous prime is 257069389. The next prime is 257069429. The reversal of 257069409 is 904960752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (257069389) and next prime (257069429).

It is a cyclic number.

It is not a de Polignac number, because 257069409 - 2¹¹ = 257067361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257069429) 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 3 ways as a sum of consecutive naturals, for example, 42844899 + ... + 42844904.

It is an arithmetic number, because the mean of its divisors is an integer number (85689804).

Almost surely, 2^257069409 is an apocalyptic number.

It is an amenable number.

257069409 is a deficient number, since it is larger than the sum of its proper divisors (85689807).

257069409 is an equidigital number, since it uses as much as digits as its factorization.

257069409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85689806.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 257069409 is about 16033.3842029685. The cubic root of 257069409 is about 635.8433492400.

The spelling of 257069409 in words is "two hundred fifty-seven million, sixty-nine thousand, four hundred nine".