49198309 has 2 divisors, whose sum is σ = 49198310. Its totient is φ = 49198308.

The previous prime is 49198307. The next prime is 49198337. The reversal of 49198309 is 90389194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 23493409 = 5070^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 49198309 - 2¹ = 49198307 is a prime.

Together with 49198307, 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 (49198307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24599154 + 24599155.

It is an arithmetic number, because the mean of its divisors is an integer number (24599155).

Almost surely, 2^49198309 is an apocalyptic number.

It is an amenable number.

49198309 is a deficient number, since it is larger than the sum of its proper divisors (1).

49198309 is an equidigital number, since it uses as much as digits as its factorization.

49198309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 49198309 is about 7014.1506256995. The cubic root of 49198309 is about 366.4235618107.

The spelling of 49198309 in words is "forty-nine million, one hundred ninety-eight thousand, three hundred nine".