1271520203 has 2 divisors, whose sum is σ = 1271520204. Its totient is φ = 1271520202.

The previous prime is 1271520179. The next prime is 1271520319. The reversal of 1271520203 is 3020251721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271520203 - 2⁶ = 1271520139 is a prime.

It is a super-2 number, since 2×1271520203² = 3233527253274322418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1271520703) 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 as a sum of consecutive naturals, namely, 635760101 + 635760102.

It is an arithmetic number, because the mean of its divisors is an integer number (635760102).

Almost surely, 2^1271520203 is an apocalyptic number.

1271520203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271520203 is an equidigital number, since it uses as much as digits as its factorization.

1271520203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1271520203 is about 35658.3819459044. The cubic root of 1271520203 is about 1083.3640541558.

Adding to 1271520203 its reverse (3020251721), we get a palindrome (4291771924).

The spelling of 1271520203 in words is "one billion, two hundred seventy-one million, five hundred twenty thousand, two hundred three".