1271972513 has 8 divisors (see below), whose sum is σ = 1473596928. Its totient is φ = 1075326624.

The previous prime is 1271972497. The next prime is 1271972539. The reversal of 1271972513 is 3152791721.

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 1271972513 - 2⁴ = 1271972497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271971513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1244081 + ... + 1245102.

It is an arithmetic number, because the mean of its divisors is an integer number (184199616).

Almost surely, 2^1271972513 is an apocalyptic number.

It is an amenable number.

1271972513 is a deficient number, since it is larger than the sum of its proper divisors (201624415).

1271972513 is an equidigital number, since it uses as much as digits as its factorization.

1271972513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489263.

The product of its digits is 26460, while the sum is 38.

The square root of 1271972513 is about 35664.7236495672. The cubic root of 1271972513 is about 1083.4924983866.

The spelling of 1271972513 in words is "one billion, two hundred seventy-one million, nine hundred seventy-two thousand, five hundred thirteen".