1275012500 has 36 divisors (see below), whose sum is σ = 2788938684. Its totient is φ = 510000000.

The previous prime is 1275012493. The next prime is 1275012509. The reversal of 1275012500 is 52105721.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1247784976 + 27227524 = 35324^2 + 5218^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275012509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38501 + ... + 63500.

It is an arithmetic number, because the mean of its divisors is an integer number (77470519).

Almost surely, 2^1275012500 is an apocalyptic number.

1275012500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275012500 is an abundant number, since it is smaller than the sum of its proper divisors (1513926184).

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

1275012500 is an equidigital number, since it uses as much as digits as its factorization.

1275012500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102030 (or 102008 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 1275012500 is about 35707.3171772957. The cubic root of 1275012500 is about 1084.3549862457.

The spelling of 1275012500 in words is "one billion, two hundred seventy-five million, twelve thousand, five hundred".