51378133 has 4 divisors (see below), whose sum is σ = 51543648. Its totient is φ = 51212620.

The previous prime is 51378101. The next prime is 51378143. The reversal of 51378133 is 33187315.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 51378133 - 2⁵ = 51378101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51378095 and 51378104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378143) 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, 82291 + ... + 82912.

It is an arithmetic number, because the mean of its divisors is an integer number (12885912).

Almost surely, 2^51378133 is an apocalyptic number.

It is an amenable number.

51378133 is a deficient number, since it is larger than the sum of its proper divisors (165515).

51378133 is a wasteful number, since it uses less digits than its factorization.

51378133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165514.

The product of its digits is 7560, while the sum is 31.

The square root of 51378133 is about 7167.8541419312. The cubic root of 51378133 is about 371.7572437270.

The spelling of 51378133 in words is "fifty-one million, three hundred seventy-eight thousand, one hundred thirty-three".