1251445225 has 12 divisors (see below), whose sum is σ = 1643074524. Its totient is φ = 942264320.

The previous prime is 1251445193. The next prime is 1251445253. The reversal of 1251445225 is 5225441521.

It can be written as a sum of positive squares in 6 ways, for example, as 132342016 + 1119103209 = 11504^2 + 33453^2 .

It is not a de Polignac number, because 1251445225 - 2⁵ = 1251445193 is a prime.

It is a super-2 number, since 2×1251445225² = 3132230302350601250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1471864 + ... + 1472713.

It is an arithmetic number, because the mean of its divisors is an integer number (136922877).

Almost surely, 2^1251445225 is an apocalyptic number.

It is an amenable number.

1251445225 is a deficient number, since it is larger than the sum of its proper divisors (391629299).

1251445225 is a wasteful number, since it uses less digits than its factorization.

1251445225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944604 (or 2944599 counting only the distinct ones).

The product of its digits is 16000, while the sum is 31.

The square root of 1251445225 is about 35375.7717230310. The cubic root of 1251445225 is about 1077.6323375050.

Adding to 1251445225 its reverse (5225441521), we get a palindrome (6476886746).

The spelling of 1251445225 in words is "one billion, two hundred fifty-one million, four hundred forty-five thousand, two hundred twenty-five".