51423731 has 4 divisors (see below), whose sum is σ = 51721152. Its totient is φ = 51126312.

The previous prime is 51423721. The next prime is 51423733. The reversal of 51423731 is 13732415.

51423731 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 an emirpimes, since its reverse is a distinct semiprime: 13732415 = 5 ⋅2746483.

It is a cyclic number.

It is not a de Polignac number, because 51423731 - 2¹⁸ = 51161587 is a prime.

It is a super-2 number, since 2×51423731² = 5288800219920722, 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 51423731.

It is not an unprimeable number, because it can be changed into a prime (51423733) 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, 148451 + ... + 148796.

It is an arithmetic number, because the mean of its divisors is an integer number (12930288).

Almost surely, 2^51423731 is an apocalyptic number.

51423731 is a deficient number, since it is larger than the sum of its proper divisors (297421).

51423731 is a wasteful number, since it uses less digits than its factorization.

51423731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297420.

The product of its digits is 2520, while the sum is 26.

The square root of 51423731 is about 7171.0341653070. The cubic root of 51423731 is about 371.8671891681.

The spelling of 51423731 in words is "fifty-one million, four hundred twenty-three thousand, seven hundred thirty-one".