51919403 has 4 divisors (see below), whose sum is σ = 51949080. Its totient is φ = 51889728.

The previous prime is 51919393. The next prime is 51919459. The reversal of 51919403 is 30491915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30491915 = 5 ⋅6098383.

It is a cyclic number.

It is not a de Polignac number, because 51919403 - 2¹⁸ = 51657259 is a prime.

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 51919403.

It is not an unprimeable number, because it can be changed into a prime (51919493) 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, 12038 + ... + 15771.

It is an arithmetic number, because the mean of its divisors is an integer number (12987270).

Almost surely, 2^51919403 is an apocalyptic number.

51919403 is a deficient number, since it is larger than the sum of its proper divisors (29677).

51919403 is a wasteful number, since it uses less digits than its factorization.

51919403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29676.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 51919403 is about 7205.5119873608. The cubic root of 51919403 is about 373.0581767341.

The spelling of 51919403 in words is "fifty-one million, nine hundred nineteen thousand, four hundred three".