1285130857 has 4 divisors (see below), whose sum is σ = 1287382096. Its totient is φ = 1282879620.

The previous prime is 1285130851. The next prime is 1285130867. The reversal of 1285130857 is 7580315821.

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 1285130857 - 2³ = 1285130849 is a prime.

It is a super-2 number, since 2×1285130857² = 3303122639227108898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285130851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124763 + ... + 1125904.

It is an arithmetic number, because the mean of its divisors is an integer number (321845524).

Almost surely, 2^1285130857 is an apocalyptic number.

It is an amenable number.

1285130857 is a deficient number, since it is larger than the sum of its proper divisors (2251239).

1285130857 is an equidigital number, since it uses as much as digits as its factorization.

1285130857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251238.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 1285130857 is about 35848.7218321658. The cubic root of 1285130857 is about 1087.2158717280.

The spelling of 1285130857 in words is "one billion, two hundred eighty-five million, one hundred thirty thousand, eight hundred fifty-seven".