1279131618 has 16 divisors (see below), whose sum is σ = 2564712000. Its totient is φ = 425302416.

The previous prime is 1279131617. The next prime is 1279131643. The reversal of 1279131618 is 8161319721.

It is not an unprimeable number, because it can be changed into a prime (1279131613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266118 + ... + 270881.

It is an arithmetic number, because the mean of its divisors is an integer number (160294500).

Almost surely, 2^1279131618 is an apocalyptic number.

1279131618 is an abundant number, since it is smaller than the sum of its proper divisors (1285580382).

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

1279131618 is a wasteful number, since it uses less digits than its factorization.

1279131618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537401.

The product of its digits is 18144, while the sum is 39.

The square root of 1279131618 is about 35764.9495735699. The cubic root of 1279131618 is about 1085.5214544871.

The spelling of 1279131618 in words is "one billion, two hundred seventy-nine million, one hundred thirty-one thousand, six hundred eighteen".