51407731 has 4 divisors (see below), whose sum is σ = 51422112. Its totient is φ = 51393352.

The previous prime is 51407669. The next prime is 51407753. The reversal of 51407731 is 13770415.

51407731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13770415 = 5 ⋅2754083.

It is a cyclic number.

It is not a de Polignac number, because 51407731 - 2¹³ = 51399539 is a prime.

It is a super-2 number, since 2×51407731² = 5285509613136722, which contains 22 as substring.

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 51407731.

It is not an unprimeable number, because it can be changed into a prime (51407761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790 + ... + 10516.

It is an arithmetic number, because the mean of its divisors is an integer number (12855528).

Almost surely, 2^51407731 is an apocalyptic number.

51407731 is a deficient number, since it is larger than the sum of its proper divisors (14381).

51407731 is an equidigital number, since it uses as much as digits as its factorization.

51407731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14380.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 51407731 is about 7169.9184793134. The cubic root of 51407731 is about 371.8286175327.

The spelling of 51407731 in words is "fifty-one million, four hundred seven thousand, seven hundred thirty-one".