1487478781 has 2 divisors, whose sum is σ = 1487478782. Its totient is φ = 1487478780.

The previous prime is 1487478779. The next prime is 1487478787. The reversal of 1487478781 is 1878747841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1325324025 + 162154756 = 36405^2 + 12734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1487478781 - 2¹ = 1487478779 is a prime.

It is a super-2 number, since 2×1487478781² = 4425186247850491922, which contains 22 as substring.

Together with 1487478779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1487478787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 743739390 + 743739391.

It is an arithmetic number, because the mean of its divisors is an integer number (743739391).

Almost surely, 2^1487478781 is an apocalyptic number.

It is an amenable number.

1487478781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1487478781 is an equidigital number, since it uses as much as digits as its factorization.

1487478781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2809856, while the sum is 55.

The square root of 1487478781 is about 38567.8464656766. The cubic root of 1487478781 is about 1141.5201790442.

The spelling of 1487478781 in words is "one billion, four hundred eighty-seven million, four hundred seventy-eight thousand, seven hundred eighty-one".