1257675861 has 48 divisors (see below), whose sum is σ = 1970075520. Its totient is φ = 710461440.

The previous prime is 1257675851. The next prime is 1257675869. The reversal of 1257675861 is 1685767521.

It is not a de Polignac number, because 1257675861 - 2¹⁴ = 1257659477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1257675861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257675869) 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 47 ways as a sum of consecutive naturals, for example, 351600 + ... + 355158.

It is an arithmetic number, because the mean of its divisors is an integer number (41043240).

Almost surely, 2^1257675861 is an apocalyptic number.

It is an amenable number.

1257675861 is a deficient number, since it is larger than the sum of its proper divisors (712399659).

1257675861 is a wasteful number, since it uses less digits than its factorization.

1257675861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646 (or 3633 counting only the distinct ones).

The product of its digits is 705600, while the sum is 48.

The square root of 1257675861 is about 35463.7259886775. The cubic root of 1257675861 is about 1079.4177992039.

The spelling of 1257675861 in words is "one billion, two hundred fifty-seven million, six hundred seventy-five thousand, eight hundred sixty-one".