1251203264 has 56 divisors (see below), whose sum is σ = 2662367040. Its totient is φ = 581308416.

The previous prime is 1251203263. The next prime is 1251203287. The reversal of 1251203264 is 4623021521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1251203263) 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 7 ways as a sum of consecutive naturals, for example, 78674 + ... + 93230.

Almost surely, 2^1251203264 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 1251203264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331183520).

1251203264 is an abundant number, since it is smaller than the sum of its proper divisors (1411163776).

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

1251203264 is a wasteful number, since it uses less digits than its factorization.

1251203264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14665 (or 14655 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1251203264 is about 35372.3516888544. The cubic root of 1251203264 is about 1077.5628813277.

Adding to 1251203264 its reverse (4623021521), we get a palindrome (5874224785).

The spelling of 1251203264 in words is "one billion, two hundred fifty-one million, two hundred three thousand, two hundred sixty-four".