50981389 has 8 divisors (see below), whose sum is σ = 54678240. Its totient is φ = 47385936.

The previous prime is 50981321. The next prime is 50981423. The reversal of 50981389 is 98318905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 50981389 - 2⁷ = 50981261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50981089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24307 + ... + 26320.

It is an arithmetic number, because the mean of its divisors is an integer number (6834780).

Almost surely, 2^50981389 is an apocalyptic number.

It is an amenable number.

50981389 is a deficient number, since it is larger than the sum of its proper divisors (3696851).

50981389 is a wasteful number, since it uses less digits than its factorization.

50981389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50699.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 50981389 is about 7140.1252790130. The cubic root of 50981389 is about 370.7978619047.

The spelling of 50981389 in words is "fifty million, nine hundred eighty-one thousand, three hundred eighty-nine".