49518681 has 4 divisors (see below), whose sum is σ = 66024912. Its totient is φ = 33012452.

The previous prime is 49518661. The next prime is 49518709. The reversal of 49518681 is 18681594.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 49518681 - 2²¹ = 47421529 is a prime.

It is a super-2 number, since 2×49518681² = 4904199535959522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (49518661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8253111 + ... + 8253116.

It is an arithmetic number, because the mean of its divisors is an integer number (16506228).

Almost surely, 2^49518681 is an apocalyptic number.

It is an amenable number.

49518681 is a deficient number, since it is larger than the sum of its proper divisors (16506231).

49518681 is a wasteful number, since it uses less digits than its factorization.

49518681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16506230.

The product of its digits is 69120, while the sum is 42.

The square root of 49518681 is about 7036.9511153624. The cubic root of 49518681 is about 367.2172066661.

The spelling of 49518681 in words is "forty-nine million, five hundred eighteen thousand, six hundred eighty-one".