1251510216 has 128 divisors (see below), whose sum is σ = 3627970560. Its totient is φ = 355558400.

The previous prime is 1251510193. The next prime is 1251510217. The reversal of 1251510216 is 6120151521.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1251510217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1934005 + ... + 1934651.

It is an arithmetic number, because the mean of its divisors is an integer number (28343520).

Almost surely, 2^1251510216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251510216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1813985280).

1251510216 is an abundant number, since it is smaller than the sum of its proper divisors (2376460344).

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

1251510216 is a wasteful number, since it uses less digits than its factorization.

1251510216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 1111 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1251510216 is about 35376.6902917726. The cubic root of 1251510216 is about 1077.6509919880.

Adding to 1251510216 its reverse (6120151521), we get a palindrome (7371661737).

The spelling of 1251510216 in words is "one billion, two hundred fifty-one million, five hundred ten thousand, two hundred sixteen".