1256270705 has 4 divisors (see below), whose sum is σ = 1507524852. Its totient is φ = 1005016560.

The previous prime is 1256270699. The next prime is 1256270711. The reversal of 1256270705 is 5070726521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5070726521 = 7 ⋅724389503.

It is an interprime number because it is at equal distance from previous prime (1256270699) and next prime (1256270711).

It can be written as a sum of positive squares in 2 ways, for example, as 272382016 + 983888689 = 16504^2 + 31367^2 .

It is not a de Polignac number, because 1256270705 - 2¹⁸ = 1256008561 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, 125627066 + ... + 125627075.

It is an arithmetic number, because the mean of its divisors is an integer number (376881213).

Almost surely, 2^1256270705 is an apocalyptic number.

It is an amenable number.

1256270705 is a deficient number, since it is larger than the sum of its proper divisors (251254147).

1256270705 is an equidigital number, since it uses as much as digits as its factorization.

1256270705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251254146.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 1256270705 is about 35443.9092793106. The cubic root of 1256270705 is about 1079.0156511716.

The spelling of 1256270705 in words is "one billion, two hundred fifty-six million, two hundred seventy thousand, seven hundred five".