257427309091 has 4 divisors (see below), whose sum is σ = 257432261184. Its totient is φ = 257422357000.

The previous prime is 257427309053. The next prime is 257427309103. The reversal of 257427309091 is 190903724752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257427309091 - 2¹¹ = 257427307043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257427319091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397235 + ... + 2502316.

It is an arithmetic number, because the mean of its divisors is an integer number (64358065296).

Almost surely, 2^257427309091 is an apocalyptic number.

257427309091 is a deficient number, since it is larger than the sum of its proper divisors (4952093).

257427309091 is an equidigital number, since it uses as much as digits as its factorization.

257427309091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952092.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 257427309091 in words is "two hundred fifty-seven billion, four hundred twenty-seven million, three hundred nine thousand, ninety-one".