51499927 has 4 divisors (see below), whose sum is σ = 51766960. Its totient is φ = 51232896.

The previous prime is 51499891. The next prime is 51499933. The reversal of 51499927 is 72999415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72999415 = 5 ⋅14599883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51499927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499957) 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, 133227 + ... + 133612.

It is an arithmetic number, because the mean of its divisors is an integer number (12941740).

Almost surely, 2^51499927 is an apocalyptic number.

51499927 is a deficient number, since it is larger than the sum of its proper divisors (267033).

51499927 is a wasteful number, since it uses less digits than its factorization.

51499927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267032.

The product of its digits is 204120, while the sum is 46.

The square root of 51499927 is about 7176.3449610509. The cubic root of 51499927 is about 372.0507672457.

The spelling of 51499927 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred twenty-seven".