51693619 has 4 divisors (see below), whose sum is σ = 51715720. Its totient is φ = 51671520.

The previous prime is 51693599. The next prime is 51693637. The reversal of 51693619 is 91639615.

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-51693619 is a prime.

It is a super-2 number, since 2×51693619² = 5344460490634322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51693659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7062 + ... + 12379.

It is an arithmetic number, because the mean of its divisors is an integer number (12928930).

Almost surely, 2^51693619 is an apocalyptic number.

51693619 is a deficient number, since it is larger than the sum of its proper divisors (22101).

51693619 is a wasteful number, since it uses less digits than its factorization.

51693619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22100.

The product of its digits is 43740, while the sum is 40.

The square root of 51693619 is about 7189.8274666365. The cubic root of 51693619 is about 372.5166132254.

The spelling of 51693619 in words is "fifty-one million, six hundred ninety-three thousand, six hundred nineteen".