1251145000 has 80 divisors (see below), whose sum is σ = 3350302560. Its totient is φ = 428952000.

The previous prime is 1251144997. The next prime is 1251145019. The reversal of 1251145000 is 5411521.

It is a super-2 number, since 2×1251145000² = 3130727622050000000, which contains 22 as substring.

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, 17127 + ... + 52873.

It is an arithmetic number, because the mean of its divisors is an integer number (41878782).

Almost surely, 2^1251145000 is an apocalyptic number.

1251145000 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 1251145000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675151280).

1251145000 is an abundant number, since it is smaller than the sum of its proper divisors (2099157560).

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

1251145000 is an equidigital number, since it uses as much as digits as its factorization.

1251145000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35780 (or 35761 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1251145000 is about 35371.5280981752. The cubic root of 1251145000 is about 1077.5461550024.

Adding to 1251145000 its reverse (5411521), we get a palindrome (1256556521).

The spelling of 1251145000 in words is "one billion, two hundred fifty-one million, one hundred forty-five thousand".