1252020145 has 4 divisors (see below), whose sum is σ = 1502424180. Its totient is φ = 1001616112.

The previous prime is 1252020137. The next prime is 1252020151. The reversal of 1252020145 is 5410202521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 593019904 + 659000241 = 24352^2 + 25671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252020145 - 2³ = 1252020137 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, 125202010 + ... + 125202019.

It is an arithmetic number, because the mean of its divisors is an integer number (375606045).

Almost surely, 2^1252020145 is an apocalyptic number.

It is an amenable number.

1252020145 is a deficient number, since it is larger than the sum of its proper divisors (250404035).

1252020145 is an equidigital number, since it uses as much as digits as its factorization.

1252020145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250404034.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1252020145 is about 35383.8966904438. The cubic root of 1252020145 is about 1077.7973354131.

Adding to 1252020145 its reverse (5410202521), we get a palindrome (6662222666).

The spelling of 1252020145 in words is "one billion, two hundred fifty-two million, twenty thousand, one hundred forty-five".