1255164138 has 24 divisors (see below), whose sum is σ = 2813300100. Its totient is φ = 403960704.

The previous prime is 1255164137. The next prime is 1255164173. The reversal of 1255164138 is 8314615521.

1255164138 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 1 + 641 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1255072329 + 91809 = 35427^2 + 303^2 .

It is not an unprimeable number, because it can be changed into a prime (1255164137) 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 11 ways as a sum of consecutive naturals, for example, 1201743 + ... + 1202786.

Almost surely, 2^1255164138 is an apocalyptic number.

1255164138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1255164138 is an abundant number, since it is smaller than the sum of its proper divisors (1558135962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255164138 is a wasteful number, since it uses less digits than its factorization.

1255164138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404566 (or 2404563 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1255164138 is about 35428.2957253097. The cubic root of 1255164138 is about 1078.6987465819.

Adding to 1255164138 its reverse (8314615521), we get a palindrome (9569779659).

The spelling of 1255164138 in words is "one billion, two hundred fifty-five million, one hundred sixty-four thousand, one hundred thirty-eight".