4256981 has 2 divisors, whose sum is σ = 4256982. Its totient is φ = 4256980.

The previous prime is 4256977. The next prime is 4257017. The reversal of 4256981 is 1896524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4036081 + 220900 = 2009^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 4256981 - 2² = 4256977 is a prime.

It is a super-2 number, since 2×4256981² = 36243774468722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4256921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2128490 + 2128491.

It is an arithmetic number, because the mean of its divisors is an integer number (2128491).

Almost surely, 2^4256981 is an apocalyptic number.

It is an amenable number.

4256981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4256981 is an equidigital number, since it uses as much as digits as its factorization.

4256981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 4256981 is about 2063.2452592942. The cubic root of 4256981 is about 162.0692306854.

The spelling of 4256981 in words is "four million, two hundred fifty-six thousand, nine hundred eighty-one".