1285481357 has 4 divisors (see below), whose sum is σ = 1287036576. Its totient is φ = 1283926140.

The previous prime is 1285481291. The next prime is 1285481359. The reversal of 1285481357 is 7531845821.

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 1285481357 - 2⁸ = 1285481101 is a prime.

It is a super-2 number, since 2×1285481357² = 3304924638389122898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285481359) 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, 776369 + ... + 778022.

It is an arithmetic number, because the mean of its divisors is an integer number (321759144).

Almost surely, 2^1285481357 is an apocalyptic number.

It is an amenable number.

1285481357 is a deficient number, since it is larger than the sum of its proper divisors (1555219).

1285481357 is an equidigital number, since it uses as much as digits as its factorization.

1285481357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555218.

The product of its digits is 268800, while the sum is 44.

The square root of 1285481357 is about 35853.6100971715. The cubic root of 1285481357 is about 1087.3147033042.

The spelling of 1285481357 in words is "one billion, two hundred eighty-five million, four hundred eighty-one thousand, three hundred fifty-seven".