51605193 has 4 divisors (see below), whose sum is σ = 68806928. Its totient is φ = 34403460.

The previous prime is 51605189. The next prime is 51605221. The reversal of 51605193 is 39150615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51605193 - 2² = 51605189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51605193.

It is not an unprimeable number, because it can be changed into a prime (51605153) 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, 8600863 + ... + 8600868.

It is an arithmetic number, because the mean of its divisors is an integer number (17201732).

Almost surely, 2^51605193 is an apocalyptic number.

It is an amenable number.

51605193 is a deficient number, since it is larger than the sum of its proper divisors (17201735).

51605193 is a wasteful number, since it uses less digits than its factorization.

51605193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17201734.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51605193 is about 7183.6754520231. The cubic root of 51605193 is about 372.3040856782.

The spelling of 51605193 in words is "fifty-one million, six hundred five thousand, one hundred ninety-three".