51243479 has 4 divisors (see below), whose sum is σ = 58563984. Its totient is φ = 43922976.

The previous prime is 51243473. The next prime is 51243497. The reversal of 51243479 is 97434215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97434215 = 5 ⋅19486843.

It is a cyclic number.

It is not a de Polignac number, because 51243479 - 2⁸ = 51243223 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 (51243473) 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, 3660242 + ... + 3660255.

It is an arithmetic number, because the mean of its divisors is an integer number (14640996).

Almost surely, 2^51243479 is an apocalyptic number.

51243479 is a deficient number, since it is larger than the sum of its proper divisors (7320505).

51243479 is an equidigital number, since it uses as much as digits as its factorization.

51243479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7320504.

The product of its digits is 30240, while the sum is 35.

The square root of 51243479 is about 7158.4550707537. The cubic root of 51243479 is about 371.4321871795.

The spelling of 51243479 in words is "fifty-one million, two hundred forty-three thousand, four hundred seventy-nine".