1257486641 has 4 divisors (see below), whose sum is σ = 1257998832. Its totient is φ = 1256974452.

The previous prime is 1257486631. The next prime is 1257486653. The reversal of 1257486641 is 1466847521.

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 a cyclic number.

It is not a de Polignac number, because 1257486641 - 2³⁰ = 183744817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1257486592 and 1257486601.

It is not an unprimeable number, because it can be changed into a prime (1257486631) 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 3 ways as a sum of consecutive naturals, for example, 252395 + ... + 257328.

It is an arithmetic number, because the mean of its divisors is an integer number (314499708).

Almost surely, 2^1257486641 is an apocalyptic number.

It is an amenable number.

1257486641 is a deficient number, since it is larger than the sum of its proper divisors (512191).

1257486641 is an equidigital number, since it uses as much as digits as its factorization.

1257486641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512190.

The product of its digits is 322560, while the sum is 44.

The square root of 1257486641 is about 35461.0580919408. The cubic root of 1257486641 is about 1079.3636629233.

The spelling of 1257486641 in words is "one billion, two hundred fifty-seven million, four hundred eighty-six thousand, six hundred forty-one".