49909021 has 2 divisors, whose sum is σ = 49909022. Its totient is φ = 49909020.

The previous prime is 49909019. The next prime is 49909051. The reversal of 49909021 is 12090994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31203396 + 18705625 = 5586^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 49909021 - 2¹ = 49909019 is a prime.

Together with 49909019, 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 (49909051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24954510 + 24954511.

It is an arithmetic number, because the mean of its divisors is an integer number (24954511).

Almost surely, 2^49909021 is an apocalyptic number.

It is an amenable number.

49909021 is a deficient number, since it is larger than the sum of its proper divisors (1).

49909021 is an equidigital number, since it uses as much as digits as its factorization.

49909021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 49909021 is about 7064.6316959910. The cubic root of 49909021 is about 368.1795678662.

The spelling of 49909021 in words is "forty-nine million, nine hundred nine thousand, twenty-one".