1200071271 has 32 divisors (see below), whose sum is σ = 1877331456. Its totient is φ = 667584000.

The previous prime is 1200071263. The next prime is 1200071273. The reversal of 1200071271 is 1721700021.

It is a happy number.

It is not a de Polignac number, because 1200071271 - 2³ = 1200071263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200071273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490411 + ... + 492851.

It is an arithmetic number, because the mean of its divisors is an integer number (58666608).

Almost surely, 2^1200071271 is an apocalyptic number.

1200071271 is a deficient number, since it is larger than the sum of its proper divisors (677260185).

1200071271 is a wasteful number, since it uses less digits than its factorization.

1200071271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 1200071271 is about 34642.0448443795. The cubic root of 1200071271 is about 1062.6796067491.

Adding to 1200071271 its reverse (1721700021), we get a palindrome (2921771292).

It can be divided in two parts, 120007 and 1271, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 1200071271 in words is "one billion, two hundred million, seventy-one thousand, two hundred seventy-one".