5181281487 has 6 divisors (see below), whose sum is σ = 7484073272. Its totient is φ = 3454187652.

The previous prime is 5181281473. The next prime is 5181281519. The reversal of 5181281487 is 7841821815.

5181281487 is a `hidden beast` number, since 518 + 12 + 81 + 48 + 7 = 666.

It is not a de Polignac number, because 5181281487 - 2⁶ = 5181281423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181281447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287848963 + ... + 287848980.

Almost surely, 2^5181281487 is an apocalyptic number.

5181281487 is a deficient number, since it is larger than the sum of its proper divisors (2302791785).

5181281487 is a wasteful number, since it uses less digits than its factorization.

5181281487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575697949 (or 575697946 counting only the distinct ones).

The product of its digits is 143360, while the sum is 45.

The square root of 5181281487 is about 71981.1189618500. The cubic root of 5181281487 is about 1730.3969025970.

The spelling of 5181281487 in words is "five billion, one hundred eighty-one million, two hundred eighty-one thousand, four hundred eighty-seven".