1256875001 has 2 divisors, whose sum is σ = 1256875002. Its totient is φ = 1256875000.

The previous prime is 1256874979. The next prime is 1256875003. The reversal of 1256875001 is 1005786521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228572601 + 28302400 = 35051^2 + 5320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256875001 - 2⁶ = 1256874937 is a prime.

It is a Sophie Germain prime.

Together with 1256875003, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1256875003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628437500 + 628437501.

It is an arithmetic number, because the mean of its divisors is an integer number (628437501).

Almost surely, 2^1256875001 is an apocalyptic number.

It is an amenable number.

1256875001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256875001 is an equidigital number, since it uses as much as digits as its factorization.

1256875001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 1256875001 is about 35452.4329348495. The cubic root of 1256875001 is about 1079.1886341435.

The spelling of 1256875001 in words is "one billion, two hundred fifty-six million, eight hundred seventy-five thousand, one".