51903923 has 4 divisors (see below), whose sum is σ = 51922728. Its totient is φ = 51885120.

The previous prime is 51903899. The next prime is 51903931. The reversal of 51903923 is 32930915.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51903923 - 2¹⁶ = 51838387 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 51903923.

It is not an unprimeable number, because it can be changed into a prime (51903223) 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, 4361 + ... + 11082.

It is an arithmetic number, because the mean of its divisors is an integer number (12980682).

Almost surely, 2^51903923 is an apocalyptic number.

51903923 is a deficient number, since it is larger than the sum of its proper divisors (18805).

51903923 is a wasteful number, since it uses less digits than its factorization.

51903923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18804.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 51903923 is about 7204.4377296219. The cubic root of 51903923 is about 373.0210967327.

The spelling of 51903923 in words is "fifty-one million, nine hundred three thousand, nine hundred twenty-three".