1251425320 has 16 divisors (see below), whose sum is σ = 2815707060. Its totient is φ = 500570112.

The previous prime is 1251425303. The next prime is 1251425323. The reversal of 1251425320 is 235241521.

It can be written as a sum of positive squares in 2 ways, for example, as 1211457636 + 39967684 = 34806^2 + 6322^2 .

It is not an unprimeable number, because it can be changed into a prime (1251425323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15642777 + ... + 15642856.

Almost surely, 2^1251425320 is an apocalyptic number.

1251425320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251425320 is an abundant number, since it is smaller than the sum of its proper divisors (1564281740).

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

1251425320 is a wasteful number, since it uses less digits than its factorization.

1251425320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31285644 (or 31285640 counting only the distinct ones).

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

The square root of 1251425320 is about 35375.4903852936. The cubic root of 1251425320 is about 1077.6266240080.

Adding to 1251425320 its reverse (235241521), we get a palindrome (1486666841).

The spelling of 1251425320 in words is "one billion, two hundred fifty-one million, four hundred twenty-five thousand, three hundred twenty".