1285218311 has 16 divisors (see below), whose sum is σ = 1520279040. Its totient is φ = 1075044960.

The previous prime is 1285218301. The next prime is 1285218329. The reversal of 1285218311 is 1138125821.

It is a cyclic number.

It is not a de Polignac number, because 1285218311 - 2³⁰ = 211476487 is a prime.

It is a super-2 number, since 2×1285218311² = 3303572213859385442, 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 (1285218301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107435 + ... + 118796.

It is an arithmetic number, because the mean of its divisors is an integer number (95017440).

Almost surely, 2^1285218311 is an apocalyptic number.

1285218311 is a deficient number, since it is larger than the sum of its proper divisors (235060729).

1285218311 is a wasteful number, since it uses less digits than its factorization.

1285218311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226286.

The product of its digits is 3840, while the sum is 32.

The square root of 1285218311 is about 35849.9415759636. The cubic root of 1285218311 is about 1087.2405330870.

The spelling of 1285218311 in words is "one billion, two hundred eighty-five million, two hundred eighteen thousand, three hundred eleven".