1251315500 has 48 divisors (see below), whose sum is σ = 2747244864. Its totient is φ = 497894400.

The previous prime is 1251315497. The next prime is 1251315551. The reversal of 1251315500 is 55131521.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90017 + ... + 102983.

It is an arithmetic number, because the mean of its divisors is an integer number (57234268).

Almost surely, 2^1251315500 is an apocalyptic number.

1251315500 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 1251315500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1373622432).

1251315500 is an abundant number, since it is smaller than the sum of its proper divisors (1495929364).

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

1251315500 is a wasteful number, since it uses less digits than its factorization.

1251315500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13179 (or 13167 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1251315500 is about 35373.9381466073. The cubic root of 1251315500 is about 1077.5951003750.

The spelling of 1251315500 in words is "one billion, two hundred fifty-one million, three hundred fifteen thousand, five hundred".