1251025705 has 4 divisors (see below), whose sum is σ = 1501230852. Its totient is φ = 1000820560.

The previous prime is 1251025679. The next prime is 1251025771. The reversal of 1251025705 is 5075201521.

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 652342681 + 598683024 = 25541^2 + 24468^2 .

It is not a de Polignac number, because 1251025705 - 2⁵ = 1251025673 is a prime.

It is a Duffinian number.

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, 125102566 + ... + 125102575.

It is an arithmetic number, because the mean of its divisors is an integer number (375307713).

Almost surely, 2^1251025705 is an apocalyptic number.

It is an amenable number.

1251025705 is a deficient number, since it is larger than the sum of its proper divisors (250205147).

1251025705 is an equidigital number, since it uses as much as digits as its factorization.

1251025705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250205146.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 1251025705 is about 35369.8417440621. The cubic root of 1251025705 is about 1077.5119063863.

The spelling of 1251025705 in words is "one billion, two hundred fifty-one million, twenty-five thousand, seven hundred five".