1251325240 has 64 divisors (see below), whose sum is σ = 3110400000. Its totient is φ = 449255040.

The previous prime is 1251325183. The next prime is 1251325247. The reversal of 1251325240 is 425231521.

It is a super-2 number, since 2×1251325240² = 3131629712522115200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251325247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16761 + ... + 52759.

It is an arithmetic number, because the mean of its divisors is an integer number (48600000).

Almost surely, 2^1251325240 is an apocalyptic number.

1251325240 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 1251325240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555200000).

1251325240 is an abundant number, since it is smaller than the sum of its proper divisors (1859074760).

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

1251325240 is a wasteful number, since it uses less digits than its factorization.

1251325240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36100 (or 36096 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1251325240 is about 35374.0758183164. The cubic root of 1251325240 is about 1077.5978962990.

Adding to 1251325240 its reverse (425231521), we get a palindrome (1676556761).

The spelling of 1251325240 in words is "one billion, two hundred fifty-one million, three hundred twenty-five thousand, two hundred forty".