2478781489 has 2 divisors, whose sum is σ = 2478781490. Its totient is φ = 2478781488.

The previous prime is 2478781429. The next prime is 2478781493. The reversal of 2478781489 is 9841878742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1689621025 + 789160464 = 41105^2 + 28092^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478781489 - 2²⁷ = 2344563761 is a prime.

It is a super-2 number, since 2×2478781489² = 12288715340418114242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2478781429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239390744 + 1239390745.

It is an arithmetic number, because the mean of its divisors is an integer number (1239390745).

Almost surely, 2^2478781489 is an apocalyptic number.

It is an amenable number.

2478781489 is a deficient number, since it is larger than the sum of its proper divisors (1).

2478781489 is an equidigital number, since it uses as much as digits as its factorization.

2478781489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 58.

The square root of 2478781489 is about 49787.3627439735. The cubic root of 2478781489 is about 1353.3581670091.

It can be divided in two parts, 24787 and 81489, that added together give a square (106276 = 326²).

The spelling of 2478781489 in words is "two billion, four hundred seventy-eight million, seven hundred eighty-one thousand, four hundred eighty-nine".