51219793 has 16 divisors (see below), whose sum is σ = 55544400. Its totient is φ = 47056896.

The previous prime is 51219769. The next prime is 51219823. The reversal of 51219793 is 39791215.

It can be written as a sum of positive squares in 8 ways, for example, as 2331729 + 48888064 = 1527^2 + 6992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51219793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51219293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184771 + ... + 185047.

It is an arithmetic number, because the mean of its divisors is an integer number (3471525).

Almost surely, 2^51219793 is an apocalyptic number.

It is an amenable number.

51219793 is a deficient number, since it is larger than the sum of its proper divisors (4324607).

51219793 is a wasteful number, since it uses less digits than its factorization.

51219793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its digits is 17010, while the sum is 37.

The square root of 51219793 is about 7156.8004722781. The cubic root of 51219793 is about 371.3749499868.

The spelling of 51219793 in words is "fifty-one million, two hundred nineteen thousand, seven hundred ninety-three".