50081309 has 4 divisors (see below), whose sum is σ = 50447004. Its totient is φ = 49715616.

The previous prime is 50081299. The next prime is 50081357. The reversal of 50081309 is 90318005.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90318005 = 5 ⋅18063601.

It can be written as a sum of positive squares in 2 ways, for example, as 40284409 + 9796900 = 6347^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 50081309 - 2¹² = 50077213 is a prime.

It is a super-2 number, since 2×50081309² = 5016275022306962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50081389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182642 + ... + 182915.

It is an arithmetic number, because the mean of its divisors is an integer number (12611751).

Almost surely, 2^50081309 is an apocalyptic number.

It is an amenable number.

50081309 is a deficient number, since it is larger than the sum of its proper divisors (365695).

50081309 is a wasteful number, since it uses less digits than its factorization.

50081309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365694.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 50081309 is about 7076.8148908955. The cubic root of 50081309 is about 368.6027383256.

The spelling of 50081309 in words is "fifty million, eighty-one thousand, three hundred nine".