2181463 has 2 divisors, whose sum is σ = 2181464. Its totient is φ = 2181462.

The previous prime is 2181461. The next prime is 2181469. The reversal of 2181463 is 3641812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181463 - 2¹ = 2181461 is a prime.

Together with 2181461, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090731 + 1090732.

It is an arithmetic number, because the mean of its divisors is an integer number (1090732).

2^2181463 is an apocalyptic number.

2181463 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181463 is an equidigital number, since it uses as much as digits as its factorization.

2181463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 2181463 is about 1476.9776572447. The cubic root of 2181463 is about 129.6928250487.

It can be divided in two parts, 218 and 1463, that added together give a square (1681 = 41²).

The spelling of 2181463 in words is "two million, one hundred eighty-one thousand, four hundred sixty-three".