1251052505 has 8 divisors (see below), whose sum is σ = 1501748424. Its totient is φ = 1000518400.

The previous prime is 1251052499. The next prime is 1251052507. The reversal of 1251052505 is 5052501521.

It can be written as a sum of positive squares in 4 ways, for example, as 132618256 + 1118434249 = 11516^2 + 33443^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251052505 - 2⁸ = 1251052249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251052507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22736 + ... + 54945.

It is an arithmetic number, because the mean of its divisors is an integer number (187718553).

Almost surely, 2^1251052505 is an apocalyptic number.

It is an amenable number.

1251052505 is a deficient number, since it is larger than the sum of its proper divisors (250695919).

1251052505 is an equidigital number, since it uses as much as digits as its factorization.

1251052505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80907.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1251052505 is about 35370.2205958628. The cubic root of 1251052505 is about 1077.5196006361.

The spelling of 1251052505 in words is "one billion, two hundred fifty-one million, fifty-two thousand, five hundred five".