49904821 has 2 divisors, whose sum is σ = 49904822. Its totient is φ = 49904820.

The previous prime is 49904819. The next prime is 49904837. The reversal of 49904821 is 12840994.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46771921 + 3132900 = 6839^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 49904821 - 2¹ = 49904819 is a prime.

Together with 49904819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49904861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24952410 + 24952411.

It is an arithmetic number, because the mean of its divisors is an integer number (24952411).

Almost surely, 2^49904821 is an apocalyptic number.

It is an amenable number.

49904821 is a deficient number, since it is larger than the sum of its proper divisors (1).

49904821 is an equidigital number, since it uses as much as digits as its factorization.

49904821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 49904821 is about 7064.3344343257. The cubic root of 49904821 is about 368.1692397563.

The spelling of 49904821 in words is "forty-nine million, nine hundred four thousand, eight hundred twenty-one".