1256701001 has 4 divisors (see below), whose sum is σ = 1257247104. Its totient is φ = 1256154900.

The previous prime is 1256700997. The next prime is 1256701009. The reversal of 1256701001 is 1001076521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256701001 - 2² = 1256700997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256701009) 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, 269585 + ... + 274206.

It is an arithmetic number, because the mean of its divisors is an integer number (314311776).

Almost surely, 2^1256701001 is an apocalyptic number.

It is an amenable number.

1256701001 is a deficient number, since it is larger than the sum of its proper divisors (546103).

1256701001 is an equidigital number, since it uses as much as digits as its factorization.

1256701001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546102.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1256701001 is about 35449.9788575395. The cubic root of 1256701001 is about 1079.1388313951.

Adding to 1256701001 its reverse (1001076521), we get a palindrome (2257777522).

The spelling of 1256701001 in words is "one billion, two hundred fifty-six million, seven hundred one thousand, one".