1285381155 has 16 divisors (see below), whose sum is σ = 2104439040. Its totient is φ = 669593568.

The previous prime is 1285381133. The next prime is 1285381159. The reversal of 1285381155 is 5511835821.

It is a happy number.

It is not a de Polignac number, because 1285381155 - 2⁶ = 1285381091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285381159) 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, 995775 + ... + 997064.

It is an arithmetic number, because the mean of its divisors is an integer number (131527440).

Almost surely, 2^1285381155 is an apocalyptic number.

1285381155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1285381155 is a deficient number, since it is larger than the sum of its proper divisors (819057885).

1285381155 is a wasteful number, since it uses less digits than its factorization.

1285381155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992890.

The product of its digits is 48000, while the sum is 39.

The square root of 1285381155 is about 35852.2126932216. The cubic root of 1285381155 is about 1087.2864508683.

The spelling of 1285381155 in words is "one billion, two hundred eighty-five million, three hundred eighty-one thousand, one hundred fifty-five".