49681681 has 4 divisors (see below), whose sum is σ = 56779072. Its totient is φ = 42584292.

The previous prime is 49681663. The next prime is 49681691. The reversal of 49681681 is 18618694.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18618694 = 2 ⋅9309347.

It is a cyclic number.

It is not a de Polignac number, because 49681681 - 2⁵ = 49681649 is a prime.

It is a super-2 number, since 2×49681681² = 4936538853971522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (49681661) 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, 3548685 + ... + 3548698.

It is an arithmetic number, because the mean of its divisors is an integer number (14194768).

Almost surely, 2^49681681 is an apocalyptic number.

It is an amenable number.

49681681 is a deficient number, since it is larger than the sum of its proper divisors (7097391).

49681681 is an equidigital number, since it uses as much as digits as its factorization.

49681681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7097390.

The product of its digits is 82944, while the sum is 43.

The square root of 49681681 is about 7048.5233205261. The cubic root of 49681681 is about 367.6196867480.

The spelling of 49681681 in words is "forty-nine million, six hundred eighty-one thousand, six hundred eighty-one".