49054171981 has 2 divisors, whose sum is σ = 49054171982. Its totient is φ = 49054171980.

The previous prime is 49054171973. The next prime is 49054171997. The reversal of 49054171981 is 18917145094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43212015625 + 5842156356 = 207875^2 + 76434^2 .

It is a cyclic number.

It is not a de Polignac number, because 49054171981 - 2³ = 49054171973 is a prime.

It is a super-2 number, since 2×49054171981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49054171931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24527085990 + 24527085991.

It is an arithmetic number, because the mean of its divisors is an integer number (24527085991).

Almost surely, 2^49054171981 is an apocalyptic number.

It is an amenable number.

49054171981 is a deficient number, since it is larger than the sum of its proper divisors (1).

49054171981 is an equidigital number, since it uses as much as digits as its factorization.

49054171981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 49054171981 in words is "forty-nine billion, fifty-four million, one hundred seventy-one thousand, nine hundred eighty-one".