51693145 has 16 divisors (see below), whose sum is σ = 72097920. Its totient is φ = 34844544.

The previous prime is 51693139. The next prime is 51693149. The reversal of 51693145 is 54139615.

It is not a de Polignac number, because 51693145 - 2³ = 51693137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51693145.

It is not an unprimeable number, because it can be changed into a prime (51693149) 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, 10452 + ... + 14581.

It is an arithmetic number, because the mean of its divisors is an integer number (4506120).

Almost surely, 2^51693145 is an apocalyptic number.

It is an amenable number.

51693145 is a deficient number, since it is larger than the sum of its proper divisors (20404775).

51693145 is a wasteful number, since it uses less digits than its factorization.

51693145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25104.

The product of its digits is 16200, while the sum is 34.

The square root of 51693145 is about 7189.7945033221. The cubic root of 51693145 is about 372.5154746360.

The spelling of 51693145 in words is "fifty-one million, six hundred ninety-three thousand, one hundred forty-five".