49931909 has 2 divisors, whose sum is σ = 49931910. Its totient is φ = 49931908.

The previous prime is 49931899. The next prime is 49931929. The reversal of 49931909 is 90913994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28569025 + 21362884 = 5345^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 49931909 - 2⁸ = 49931653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49931909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49931929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24965954 + 24965955.

It is an arithmetic number, because the mean of its divisors is an integer number (24965955).

Almost surely, 2^49931909 is an apocalyptic number.

It is an amenable number.

49931909 is a deficient number, since it is larger than the sum of its proper divisors (1).

49931909 is an equidigital number, since it uses as much as digits as its factorization.

49931909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 49931909 is about 7066.2514107552. The cubic root of 49931909 is about 368.2358409670.

The spelling of 49931909 in words is "forty-nine million, nine hundred thirty-one thousand, nine hundred nine".