51273815 has 4 divisors (see below), whose sum is σ = 61528584. Its totient is φ = 41019048.

The previous prime is 51273811. The next prime is 51273829. The reversal of 51273815 is 51837215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51837215 = 5 ⋅10367443.

It is a cyclic number.

It is not a de Polignac number, because 51273815 - 2² = 51273811 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 (51273811) 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, 5127377 + ... + 5127386.

It is an arithmetic number, because the mean of its divisors is an integer number (15382146).

Almost surely, 2^51273815 is an apocalyptic number.

51273815 is a deficient number, since it is larger than the sum of its proper divisors (10254769).

51273815 is a wasteful number, since it uses less digits than its factorization.

51273815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10254768.

The product of its digits is 8400, while the sum is 32.

The square root of 51273815 is about 7160.5736502043. The cubic root of 51273815 is about 371.5054683351.

The spelling of 51273815 in words is "fifty-one million, two hundred seventy-three thousand, eight hundred fifteen".