2456981 has 2 divisors, whose sum is σ = 2456982. Its totient is φ = 2456980.

The previous prime is 2456963. The next prime is 2456983. The reversal of 2456981 is 1896542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 538756 = 1385^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2456981 - 2⁶ = 2456917 is a prime.

It is a super-2 number, since 2×2456981² = 12073511268722, which contains 22 as substring.

Together with 2456983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2456983) 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 as a sum of consecutive naturals, namely, 1228490 + 1228491.

It is an arithmetic number, because the mean of its divisors is an integer number (1228491).

2^2456981 is an apocalyptic number.

It is an amenable number.

2456981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2456981 is an equidigital number, since it uses as much as digits as its factorization.

2456981 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 2456981 is about 1567.4759966264. The cubic root of 2456981 is about 134.9378955312.

The spelling of 2456981 in words is "two million, four hundred fifty-six thousand, nine hundred eighty-one".