49187921 has 2 divisors, whose sum is σ = 49187922. Its totient is φ = 49187920.

The previous prime is 49187893. The next prime is 49187923. The reversal of 49187921 is 12978194.

49187921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 21520321 = 5260^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 49187921 - 2¹⁰ = 49186897 is a prime.

Together with 49187923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (49187923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24593960 + 24593961.

It is an arithmetic number, because the mean of its divisors is an integer number (24593961).

Almost surely, 2^49187921 is an apocalyptic number.

It is an amenable number.

49187921 is a deficient number, since it is larger than the sum of its proper divisors (1).

49187921 is an equidigital number, since it uses as much as digits as its factorization.

49187921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 49187921 is about 7013.4100835471. The cubic root of 49187921 is about 366.3977704372.

The spelling of 49187921 in words is "forty-nine million, one hundred eighty-seven thousand, nine hundred twenty-one".