1257171049 has 8 divisors (see below), whose sum is σ = 1278038240. Its totient is φ = 1236365856.

The previous prime is 1257171031. The next prime is 1257171059. The reversal of 1257171049 is 9401717521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1257171049 - 2⁷ = 1257170921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1257170999 and 1257171017.

It is not an unprimeable number, because it can be changed into a prime (1257171059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26317 + ... + 56629.

It is an arithmetic number, because the mean of its divisors is an integer number (159754780).

Almost surely, 2^1257171049 is an apocalyptic number.

It is an amenable number.

1257171049 is a deficient number, since it is larger than the sum of its proper divisors (20867191).

1257171049 is an equidigital number, since it uses as much as digits as its factorization.

1257171049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30999.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1257171049 is about 35456.6079736909. The cubic root of 1257171049 is about 1079.2733592369.

The spelling of 1257171049 in words is "one billion, two hundred fifty-seven million, one hundred seventy-one thousand, forty-nine".