49071981911 has 2 divisors, whose sum is σ = 49071981912. Its totient is φ = 49071981910.

The previous prime is 49071981841. The next prime is 49071981919. The reversal of 49071981911 is 11918917094.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49071981911 is a prime.

It is a super-2 number, since 2×49071981911² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49071981911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49071981919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24535990955 + 24535990956.

It is an arithmetic number, because the mean of its divisors is an integer number (24535990956).

Almost surely, 2^49071981911 is an apocalyptic number.

49071981911 is a deficient number, since it is larger than the sum of its proper divisors (1).

49071981911 is an equidigital number, since it uses as much as digits as its factorization.

49071981911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 50.

The spelling of 49071981911 in words is "forty-nine billion, seventy-one million, nine hundred eighty-one thousand, nine hundred eleven".