1271972501 has 4 divisors (see below), whose sum is σ = 1313003904. Its totient is φ = 1230941100.

The previous prime is 1271972497. The next prime is 1271972539. The reversal of 1271972501 is 1052791721.

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.

It is a cyclic number.

It is not a de Polignac number, because 1271972501 - 2² = 1271972497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271972591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20515655 + ... + 20515716.

It is an arithmetic number, because the mean of its divisors is an integer number (328250976).

Almost surely, 2^1271972501 is an apocalyptic number.

It is an amenable number.

1271972501 is a deficient number, since it is larger than the sum of its proper divisors (41031403).

1271972501 is an equidigital number, since it uses as much as digits as its factorization.

1271972501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41031402.

The product of its (nonzero) digits is 8820, while the sum is 35.

The square root of 1271972501 is about 35664.7234813338. The cubic root of 1271972501 is about 1083.4924949793.

The spelling of 1271972501 in words is "one billion, two hundred seventy-one million, nine hundred seventy-two thousand, five hundred one".