2455681 has 2 divisors, whose sum is σ = 2455682. Its totient is φ = 2455680.

The previous prime is 2455679. The next prime is 2455699. The reversal of 2455681 is 1865542.

2455681 = T₁₂₇₈ + T₁₂₇₉ + T₁₂₈₀.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1915456 + 540225 = 1384^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2455681 - 2¹ = 2455679 is a prime.

It is a super-2 number, since 2×2455681² = 12060738347522, which contains 22 as substring.

Together with 2455679, it forms a pair of twin primes.

It is a Chen prime.

2455681 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2455381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227840 + 1227841.

It is an arithmetic number, because the mean of its divisors is an integer number (1227841).

2^2455681 is an apocalyptic number.

2455681 is the 1280-th centered triangular number.

It is an amenable number.

2455681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2455681 is an equidigital number, since it uses as much as digits as its factorization.

2455681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The square root of 2455681 is about 1567.0612623634. The cubic root of 2455681 is about 134.9140925780.

It can be divided in two parts, 2455 and 681, that added together give a square (3136 = 56²).

The spelling of 2455681 in words is "two million, four hundred fifty-five thousand, six hundred eighty-one".