5487781 has 4 divisors (see below), whose sum is σ = 5909932. Its totient is φ = 5065632.

The previous prime is 5487773. The next prime is 5487791. The reversal of 5487781 is 1877845.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1877845 = 5 ⋅375569.

It can be written as a sum of positive squares in 2 ways, for example, as 2280100 + 3207681 = 1510^2 + 1791^2 .

It is not a de Polignac number, because 5487781 - 2³ = 5487773 is a prime.

It is a super-2 number, since 2×5487781² = 60231480607922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5487701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211056 + ... + 211081.

It is an arithmetic number, because the mean of its divisors is an integer number (1477483).

Almost surely, 2^5487781 is an apocalyptic number.

It is an amenable number.

5487781 is a deficient number, since it is larger than the sum of its proper divisors (422151).

5487781 is a wasteful number, since it uses less digits than its factorization.

5487781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422150.

The product of its digits is 62720, while the sum is 40.

The square root of 5487781 is about 2342.6013318531. The cubic root of 5487781 is about 176.3866006725.

The spelling of 5487781 in words is "five million, four hundred eighty-seven thousand, seven hundred eighty-one".