1256253601 has 8 divisors (see below), whose sum is σ = 1271181600. Its totient is φ = 1241343840.

The previous prime is 1256253589. The next prime is 1256253617. The reversal of 1256253601 is 1063526521.

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

It is a cyclic number.

It is not a de Polignac number, because 1256253601 - 2¹¹ = 1256251553 is a prime.

It is a super-2 number, since 2×1256253601² = 3156346220050934402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256223601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175470 + ... + 182488.

It is an arithmetic number, because the mean of its divisors is an integer number (158897700).

Almost surely, 2^1256253601 is an apocalyptic number.

It is an amenable number.

1256253601 is a deficient number, since it is larger than the sum of its proper divisors (14927999).

1256253601 is an equidigital number, since it uses as much as digits as its factorization.

1256253601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1256253601 is about 35443.6679958494. The cubic root of 1256253601 is about 1079.0107542527.

The spelling of 1256253601 in words is "one billion, two hundred fifty-six million, two hundred fifty-three thousand, six hundred one".