49999681 has 4 divisors (see below), whose sum is σ = 51063552. Its totient is φ = 48935812.

The previous prime is 49999673. The next prime is 49999693. The reversal of 49999681 is 18699994.

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: 18699994 = 2 ⋅9349997.

It is a cyclic number.

It is not a de Polignac number, because 49999681 - 2³ = 49999673 is a prime.

It is a super-2 number, since 2×49999681² = 4999936200203522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49991681) 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, 531865 + ... + 531958.

It is an arithmetic number, because the mean of its divisors is an integer number (12765888).

Almost surely, 2^49999681 is an apocalyptic number.

It is an amenable number.

49999681 is a deficient number, since it is larger than the sum of its proper divisors (1063871).

49999681 is a wasteful number, since it uses less digits than its factorization.

49999681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063870.

The product of its digits is 1259712, while the sum is 55.

The square root of 49999681 is about 7071.0452551232. The cubic root of 49999681 is about 368.4023663917.

The spelling of 49999681 in words is "forty-nine million, nine hundred ninety-nine thousand, six hundred eighty-one".