1271528641 has 4 divisors (see below), whose sum is σ = 1272505792. Its totient is φ = 1270551492.

The previous prime is 1271528639. The next prime is 1271528663. The reversal of 1271528641 is 1468251721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1468251721 = 11239 ⋅130639.

It is a cyclic number.

It is not a de Polignac number, because 1271528641 - 2¹ = 1271528639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271528641.

It is not an unprimeable number, because it can be changed into a prime (1271528611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486621 + ... + 489226.

It is an arithmetic number, because the mean of its divisors is an integer number (318126448).

Almost surely, 2^1271528641 is an apocalyptic number.

It is an amenable number.

1271528641 is a deficient number, since it is larger than the sum of its proper divisors (977151).

1271528641 is an equidigital number, since it uses as much as digits as its factorization.

1271528641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977150.

The product of its digits is 26880, while the sum is 37.

The square root of 1271528641 is about 35658.5002629107. The cubic root of 1271528641 is about 1083.3664506063.

The spelling of 1271528641 in words is "one billion, two hundred seventy-one million, five hundred twenty-eight thousand, six hundred forty-one".