49991143 has 2 divisors, whose sum is σ = 49991144. Its totient is φ = 49991142.

The previous prime is 49991141. The next prime is 49991159. The reversal of 49991143 is 34119994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49991143 - 2¹ = 49991141 is a prime.

It is a super-2 number, since 2×49991143² = 4998228756892898, which contains 22 as substring.

Together with 49991141, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 49991096 and 49991105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49991141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24995571 + 24995572.

It is an arithmetic number, because the mean of its divisors is an integer number (24995572).

Almost surely, 2^49991143 is an apocalyptic number.

49991143 is a deficient number, since it is larger than the sum of its proper divisors (1).

49991143 is an equidigital number, since it uses as much as digits as its factorization.

49991143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 49991143 is about 7070.4414996519. The cubic root of 49991143 is about 368.3813956015.

The spelling of 49991143 in words is "forty-nine million, nine hundred ninety-one thousand, one hundred forty-three".