49811000081 has 4 divisors (see below), whose sum is σ = 51025902564. Its totient is φ = 48596097600.

The previous prime is 49811000069. The next prime is 49811000087. The reversal of 49811000081 is 18000011894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18000011894 = 2 ⋅9000005947.

It can be written as a sum of positive squares in 2 ways, for example, as 17119105600 + 32691894481 = 130840^2 + 180809^2 .

It is a cyclic number.

It is not a de Polignac number, because 49811000081 - 2¹⁴ = 49810983697 is a prime.

It is a super-2 number, since 2×49811000081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49811000087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607451180 + ... + 607451261.

It is an arithmetic number, because the mean of its divisors is an integer number (12756475641).

Almost surely, 2^49811000081 is an apocalyptic number.

49811000081 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

49811000081 is a deficient number, since it is larger than the sum of its proper divisors (1214902483).

49811000081 is a wasteful number, since it uses less digits than its factorization.

49811000081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214902482.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 49811000081 in words is "forty-nine billion, eight hundred eleven million, eighty-one", and thus it is an aban number.