1251250145 has 4 divisors (see below), whose sum is σ = 1501500180. Its totient is φ = 1001000112.

The previous prime is 1251250139. The next prime is 1251250151. The reversal of 1251250145 is 5410521521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5410521521 = 131 ⋅41301691.

It is an interprime number because it is at equal distance from previous prime (1251250139) and next prime (1251250151).

It can be written as a sum of positive squares in 2 ways, for example, as 413552896 + 837697249 = 20336^2 + 28943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251250145 - 2⁶ = 1251250081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125125010 + ... + 125125019.

It is an arithmetic number, because the mean of its divisors is an integer number (375375045).

Almost surely, 2^1251250145 is an apocalyptic number.

It is an amenable number.

1251250145 is a deficient number, since it is larger than the sum of its proper divisors (250250035).

1251250145 is an equidigital number, since it uses as much as digits as its factorization.

1251250145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250250034.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1251250145 is about 35373.0143612331. The cubic root of 1251250145 is about 1077.5763394646.

Adding to 1251250145 its reverse (5410521521), we get a palindrome (6661771666).

The spelling of 1251250145 in words is "one billion, two hundred fifty-one million, two hundred fifty thousand, one hundred forty-five".