1285504257 has 16 divisors (see below), whose sum is σ = 1774440000. Its totient is φ = 826830144.

The previous prime is 1285504229. The next prime is 1285504271. The reversal of 1285504257 is 7524055821.

It is a de Polignac number, because none of the positive numbers 2^k-1285504257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285504217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129994 + ... + 139532.

It is an arithmetic number, because the mean of its divisors is an integer number (110902500).

Almost surely, 2^1285504257 is an apocalyptic number.

It is an amenable number.

1285504257 is a deficient number, since it is larger than the sum of its proper divisors (488935743).

1285504257 is a wasteful number, since it uses less digits than its factorization.

1285504257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120.

The product of its (nonzero) digits is 112000, while the sum is 39.

The square root of 1285504257 is about 35853.9294499222. The cubic root of 1285504257 is about 1087.3211598633.

The spelling of 1285504257 in words is "one billion, two hundred eighty-five million, five hundred four thousand, two hundred fifty-seven".