1257561085 has 8 divisors (see below), whose sum is σ = 1646261856. Its totient is φ = 914589840.

The previous prime is 1257561083. The next prime is 1257561089. The reversal of 1257561085 is 5801657521.

It is a happy number.

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

It is not a de Polignac number, because 1257561085 - 2¹ = 1257561083 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 (1257561083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11432319 + ... + 11432428.

It is an arithmetic number, because the mean of its divisors is an integer number (205782732).

Almost surely, 2^1257561085 is an apocalyptic number.

It is an amenable number.

1257561085 is a deficient number, since it is larger than the sum of its proper divisors (388700771).

1257561085 is a wasteful number, since it uses less digits than its factorization.

1257561085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22864763.

The product of its (nonzero) digits is 84000, while the sum is 40.

The square root of 1257561085 is about 35462.1077348767. The cubic root of 1257561085 is about 1079.3849621722.

The spelling of 1257561085 in words is "one billion, two hundred fifty-seven million, five hundred sixty-one thousand, eighty-five".