1251204125 has 16 divisors (see below), whose sum is σ = 1590973488. Its totient is φ = 982072000.

The previous prime is 1251204109. The next prime is 1251204197. The reversal of 1251204125 is 5214021521.

It can be written as a sum of positive squares in 8 ways, for example, as 249734809 + 1001469316 = 15803^2 + 31646^2 .

It is not a de Polignac number, because 1251204125 - 2⁴ = 1251204109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251204125.

It is a congruent 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, 87806 + ... + 101055.

It is an arithmetic number, because the mean of its divisors is an integer number (99435843).

Almost surely, 2^1251204125 is an apocalyptic number.

It is an amenable number.

1251204125 is a deficient number, since it is larger than the sum of its proper divisors (339769363).

1251204125 is an equidigital number, since it uses as much as digits as its factorization.

1251204125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188929 (or 188919 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1251204125 is about 35372.3638593747. The cubic root of 1251204125 is about 1077.5631284981.

Adding to 1251204125 its reverse (5214021521), we get a palindrome (6465225646).

The spelling of 1251204125 in words is "one billion, two hundred fifty-one million, two hundred four thousand, one hundred twenty-five".