51019893 has 12 divisors (see below), whose sum is σ = 76073088. Its totient is φ = 32915880.

The previous prime is 51019889. The next prime is 51019931. The reversal of 51019893 is 39891015.

It is a happy number.

It is not a de Polignac number, because 51019893 - 2² = 51019889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51019823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91155 + ... + 91712.

It is an arithmetic number, because the mean of its divisors is an integer number (6339424).

Almost surely, 2^51019893 is an apocalyptic number.

It is an amenable number.

51019893 is a deficient number, since it is larger than the sum of its proper divisors (25053195).

51019893 is a wasteful number, since it uses less digits than its factorization.

51019893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182904 (or 182901 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 51019893 is about 7142.8210813375. The cubic root of 51019893 is about 370.8911875173.

The spelling of 51019893 in words is "fifty-one million, nineteen thousand, eight hundred ninety-three".