1279240171 has 16 divisors (see below), whose sum is σ = 1436587488. Its totient is φ = 1129190400.

The previous prime is 1279240159. The next prime is 1279240217. The reversal of 1279240171 is 1710429721.

It is a 10-Lehmer number, since φ(1279240171) divides (1279240171-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 1279240171 - 2²⁷ = 1145022443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279240471) 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, 45241 + ... + 67861.

It is an arithmetic number, because the mean of its divisors is an integer number (89786718).

Almost surely, 2^1279240171 is an apocalyptic number.

1279240171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1279240171 is the 22621-st heptagonal number.

1279240171 is a deficient number, since it is larger than the sum of its proper divisors (157347317).

1279240171 is a wasteful number, since it uses less digits than its factorization.

1279240171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22782.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1279240171 is about 35766.4671305400. The cubic root of 1279240171 is about 1085.5521610684.

Adding to 1279240171 its reverse (1710429721), we get a palindrome (2989669892).

The spelling of 1279240171 in words is "one billion, two hundred seventy-nine million, two hundred forty thousand, one hundred seventy-one".