1271551921250 has 40 divisors (see below), whose sum is σ = 2566735178700. Its totient is φ = 469496088000.

The previous prime is 1271551921249. The next prime is 1271551921267. The reversal of 1271551921250 is 521291551721.

It can be written as a sum of positive squares in 10 ways, for example, as 202608914641 + 1068943006609 = 450121^2 + 1033897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1271551921198 and 1271551921207.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 39108425 + ... + 39140924.

Almost surely, 2^{1271551921250} is an apocalyptic number.

1271551921250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1271551921250 is an abundant number, since it is smaller than the sum of its proper divisors (1295183257450).

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

1271551921250 is an equidigital number, since it uses as much as digits as its factorization.

1271551921250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78249384 (or 78249369 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 41.

The spelling of 1271551921250 in words is "one trillion, two hundred seventy-one billion, five hundred fifty-one million, nine hundred twenty-one thousand, two hundred fifty".