1251025000 has 96 divisors (see below), whose sum is σ = 2959498080. Its totient is φ = 495720000.

The previous prime is 1251024977. The next prime is 1251025003. The reversal of 1251025000 is 5201521.

It is not an unprimeable number, because it can be changed into a prime (1251025003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4074847 + ... + 4075153.

It is an arithmetic number, because the mean of its divisors is an integer number (30828105).

Almost surely, 2^1251025000 is an apocalyptic number.

1251025000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251025000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479749040).

1251025000 is an abundant number, since it is smaller than the sum of its proper divisors (1708473080).

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

1251025000 is an equidigital number, since it uses as much as digits as its factorization.

1251025000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1251025000 is about 35369.8317779432. The cubic root of 1251025000 is about 1077.5117039801.

Adding to 1251025000 its reverse (5201521), we get a palindrome (1256226521).

The spelling of 1251025000 in words is "one billion, two hundred fifty-one million, twenty-five thousand".