1271201500 has 48 divisors (see below), whose sum is σ = 2865897216. Its totient is φ = 492072000.

The previous prime is 1271201471. The next prime is 1271201521. The reversal of 1271201500 is 51021721.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25507 + ... + 56506.

It is an arithmetic number, because the mean of its divisors is an integer number (59706192).

Almost surely, 2^1271201500 is an apocalyptic number.

1271201500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271201500 is an abundant number, since it is smaller than the sum of its proper divisors (1594695716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271201500 is a wasteful number, since it uses less digits than its factorization.

1271201500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82063 (or 82051 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 1271201500 is about 35653.9128287485. The cubic root of 1271201500 is about 1083.2735325307.

The spelling of 1271201500 in words is "one billion, two hundred seventy-one million, two hundred one thousand, five hundred".