1005045251 has 4 divisors (see below), whose sum is σ = 1148623152. Its totient is φ = 861467352.

The previous prime is 1005045193. The next prime is 1005045277. The reversal of 1005045251 is 1525405001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1005045251 - 2¹⁴ = 1005028867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005015251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71788940 + ... + 71788953.

It is an arithmetic number, because the mean of its divisors is an integer number (287155788).

Almost surely, 2^1005045251 is an apocalyptic number.

1005045251 is a deficient number, since it is larger than the sum of its proper divisors (143577901).

1005045251 is an equidigital number, since it uses as much as digits as its factorization.

1005045251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143577900.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1005045251 is about 31702.4486593701. The cubic root of 1005045251 is about 1001.6789299500.

The spelling of 1005045251 in words is "one billion, five million, forty-five thousand, two hundred fifty-one".