2455781 has 2 divisors, whose sum is σ = 2455782. Its totient is φ = 2455780.

The previous prime is 2455771. The next prime is 2455811. The reversal of 2455781 is 1875542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 410881 = 1430^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 2455781 - 2¹⁰ = 2454757 is a prime.

It is a super-2 number, since 2×2455781² = 12061720639922, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2455711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227890 + 1227891.

It is an arithmetic number, because the mean of its divisors is an integer number (1227891).

2^2455781 is an apocalyptic number.

It is an amenable number.

2455781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2455781 is an equidigital number, since it uses as much as digits as its factorization.

2455781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11200, while the sum is 32.

The square root of 2455781 is about 1567.0931688958. The cubic root of 2455781 is about 134.9159238726.

The spelling of 2455781 in words is "two million, four hundred fifty-five thousand, seven hundred eighty-one".