1251251250 has 40 divisors (see below), whose sum is σ = 3127136496. Its totient is φ = 333666000.

The previous prime is 1251251227. The next prime is 1251251263. The reversal of 1251251250 is 521521521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251251250.

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, 163084 + ... + 170583.

Almost surely, 2^1251251250 is an apocalyptic number.

1251251250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251251250 is an abundant number, since it is smaller than the sum of its proper divisors (1875885246).

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

1251251250 is an equidigital number, since it uses as much as digits as its factorization.

1251251250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333692 (or 333677 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1251251250 is about 35373.0299804809. The cubic root of 1251251250 is about 1077.5766566731.

Adding to 1251251250 its reverse (521521521), we get a palindrome (1772772771).

The spelling of 1251251250 in words is "one billion, two hundred fifty-one million, two hundred fifty-one thousand, two hundred fifty".