1251101250 has 120 divisors (see below), whose sum is σ = 3871460736. Its totient is φ = 285948000.

The previous prime is 1251101231. The next prime is 1251101263. The reversal of 1251101250 is 521011521.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 70807 + ... + 86693.

Almost surely, 2^1251101250 is an apocalyptic number.

1251101250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251101250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935730368).

1251101250 is an abundant number, since it is smaller than the sum of its proper divisors (2620359486).

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

1251101250 is a wasteful number, since it uses less digits than its factorization.

1251101250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15922 (or 15904 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1251101250 is about 35370.9096575138. The cubic root of 1251101250 is about 1077.5335949890.

Adding to 1251101250 its reverse (521011521), we get a palindrome (1772112771).

The spelling of 1251101250 in words is "one billion, two hundred fifty-one million, one hundred one thousand, two hundred fifty".