5136781281 has 8 divisors (see below), whose sum is σ = 7085215680. Its totient is φ = 3306433872.

The previous prime is 5136781277. The next prime is 5136781327. The reversal of 5136781281 is 1821876315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5136781281 - 2² = 5136781277 is a prime.

It is a super-2 number, since 2×5136781281² = 52773043857664001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5136781381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29521645 + ... + 29521818.

It is an arithmetic number, because the mean of its divisors is an integer number (885651960).

Almost surely, 2^5136781281 is an apocalyptic number.

It is an amenable number.

5136781281 is a deficient number, since it is larger than the sum of its proper divisors (1948434399).

5136781281 is a wasteful number, since it uses less digits than its factorization.

5136781281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59043495.

The product of its digits is 80640, while the sum is 42.

The square root of 5136781281 is about 71671.3421180321. The cubic root of 5136781281 is about 1725.4287283864.

The spelling of 5136781281 in words is "five billion, one hundred thirty-six million, seven hundred eighty-one thousand, two hundred eighty-one".