1271321563 has 8 divisors (see below), whose sum is σ = 1344341376. Its totient is φ = 1200302400.

The previous prime is 1271321551. The next prime is 1271321567. The reversal of 1271321563 is 3651231721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1271321563 - 2¹⁷ = 1271190491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271321567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498856 + ... + 501397.

It is an arithmetic number, because the mean of its divisors is an integer number (168042672).

Almost surely, 2^1271321563 is an apocalyptic number.

1271321563 is a deficient number, since it is larger than the sum of its proper divisors (73019813).

1271321563 is a wasteful number, since it uses less digits than its factorization.

1271321563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000325.

The product of its digits is 7560, while the sum is 31.

The square root of 1271321563 is about 35655.5965172370. The cubic root of 1271321563 is about 1083.3076359559.

The spelling of 1271321563 in words is "one billion, two hundred seventy-one million, three hundred twenty-one thousand, five hundred sixty-three".