49809961 has 2 divisors, whose sum is σ = 49809962. Its totient is φ = 49809960.

The previous prime is 49809959. The next prime is 49810021. The reversal of 49809961 is 16990894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31147561 + 18662400 = 5581^2 + 4320^2 .

It is a cyclic number.

It is not a de Polignac number, because 49809961 - 2¹ = 49809959 is a prime.

Together with 49809959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (49809911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24904980 + 24904981.

It is an arithmetic number, because the mean of its divisors is an integer number (24904981).

Almost surely, 2^49809961 is an apocalyptic number.

It is an amenable number.

49809961 is a deficient number, since it is larger than the sum of its proper divisors (1).

49809961 is an equidigital number, since it uses as much as digits as its factorization.

49809961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 49809961 is about 7057.6172324659. The cubic root of 49809961 is about 367.9358175125.

It can be divided in two parts, 4980 and 9961, that multiplied together give a triangular number (49605780 = T₉₉₆₀).

The spelling of 49809961 in words is "forty-nine million, eight hundred nine thousand, nine hundred sixty-one".