1271097216 has 96 divisors (see below), whose sum is σ = 3775811520. Its totient is φ = 410019840.

The previous prime is 1271097209. The next prime is 1271097253. The reversal of 1271097216 is 6127901721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17916 + ... + 53508.

It is an arithmetic number, because the mean of its divisors is an integer number (39331370).

Almost surely, 2^1271097216 is an apocalyptic number.

1271097216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271097216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1887905760).

1271097216 is an abundant number, since it is smaller than the sum of its proper divisors (2504714304).

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

1271097216 is a wasteful number, since it uses less digits than its factorization.

1271097216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35644 (or 35629 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 1271097216 is about 35652.4503505720. The cubic root of 1271097216 is about 1083.2439093261.

Adding to 1271097216 its reverse (6127901721), we get a palindrome (7398998937).

The spelling of 1271097216 in words is "one billion, two hundred seventy-one million, ninety-seven thousand, two hundred sixteen".