51345403 has 4 divisors (see below), whose sum is σ = 51395400. Its totient is φ = 51295408.

The previous prime is 51345379. The next prime is 51345409. The reversal of 51345403 is 30454315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30454315 = 5 ⋅6090863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51345403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51345409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23425 + ... + 25522.

It is an arithmetic number, because the mean of its divisors is an integer number (12848850).

Almost surely, 2^51345403 is an apocalyptic number.

51345403 is a deficient number, since it is larger than the sum of its proper divisors (49997).

51345403 is a wasteful number, since it uses less digits than its factorization.

51345403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49996.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 51345403 is about 7165.5706681324. The cubic root of 51345403 is about 371.6782853677.

Adding to 51345403 its reverse (30454315), we get a palindrome (81799718).

The spelling of 51345403 in words is "fifty-one million, three hundred forty-five thousand, four hundred three".