1271632501 has 4 divisors (see below), whose sum is σ = 1271795404. Its totient is φ = 1271469600.

The previous prime is 1271632499. The next prime is 1271632519. The reversal of 1271632501 is 1052361721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1130640625 + 140991876 = 33625^2 + 11874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271632501 - 2¹ = 1271632499 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 1271632501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271635501) 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, 69120 + ... + 85561.

It is an arithmetic number, because the mean of its divisors is an integer number (317948851).

Almost surely, 2^1271632501 is an apocalyptic number.

It is an amenable number.

1271632501 is a deficient number, since it is larger than the sum of its proper divisors (162903).

1271632501 is an equidigital number, since it uses as much as digits as its factorization.

1271632501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162902.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1271632501 is about 35659.9565479264. The cubic root of 1271632501 is about 1083.3959466980.

The spelling of 1271632501 in words is "one billion, two hundred seventy-one million, six hundred thirty-two thousand, five hundred one".