51345047 has 4 divisors (see below), whose sum is σ = 55294680. Its totient is φ = 47395416.

The previous prime is 51345043. The next prime is 51345059. The reversal of 51345047 is 74054315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74054315 = 5 ⋅14810863.

It is a cyclic number.

It is not a de Polignac number, because 51345047 - 2² = 51345043 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 (51345043) 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, 1974797 + ... + 1974822.

It is an arithmetic number, because the mean of its divisors is an integer number (13823670).

Almost surely, 2^51345047 is an apocalyptic number.

51345047 is a deficient number, since it is larger than the sum of its proper divisors (3949633).

51345047 is a wasteful number, since it uses less digits than its factorization.

51345047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949632.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 51345047 is about 7165.5458270811. The cubic root of 51345047 is about 371.6774263633.

The spelling of 51345047 in words is "fifty-one million, three hundred forty-five thousand, forty-seven".