1257041717 has 4 divisors (see below), whose sum is σ = 1257115776. Its totient is φ = 1256967660.

The previous prime is 1257041647. The next prime is 1257041749. The reversal of 1257041717 is 7171407521.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7171407521 = 23 ⋅311800327.

It is a cyclic number.

It is not a de Polignac number, because 1257041717 - 2¹⁴ = 1257025333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257046717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2492 + ... + 50202.

It is an arithmetic number, because the mean of its divisors is an integer number (314278944).

Almost surely, 2^1257041717 is an apocalyptic number.

It is an amenable number.

1257041717 is a deficient number, since it is larger than the sum of its proper divisors (74059).

1257041717 is an equidigital number, since it uses as much as digits as its factorization.

1257041717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74058.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 1257041717 is about 35454.7841200592. The cubic root of 1257041717 is about 1079.2363477342.

The spelling of 1257041717 in words is "one billion, two hundred fifty-seven million, forty-one thousand, seven hundred seventeen".