50921819 has 4 divisors (see below), whose sum is σ = 54838896. Its totient is φ = 47004744.

The previous prime is 50921791. The next prime is 50921831. The reversal of 50921819 is 91812905.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50921819 is a prime.

It is a super-2 number, since 2×50921819² = 5186063300537522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50921869) 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, 1958519 + ... + 1958544.

It is an arithmetic number, because the mean of its divisors is an integer number (13709724).

Almost surely, 2^50921819 is an apocalyptic number.

50921819 is a deficient number, since it is larger than the sum of its proper divisors (3917077).

50921819 is a wasteful number, since it uses less digits than its factorization.

50921819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917076.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 50921819 is about 7135.9525643042. The cubic root of 50921819 is about 370.6533841005.

The spelling of 50921819 in words is "fifty million, nine hundred twenty-one thousand, eight hundred nineteen".