51903145 has 16 divisors (see below), whose sum is σ = 73479168. Its totient is φ = 34441920.

The previous prime is 51903139. The next prime is 51903149. The reversal of 51903145 is 54130915.

It is not a de Polignac number, because 51903145 - 2²⁵ = 18348713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51903149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22834 + ... + 25003.

It is an arithmetic number, because the mean of its divisors is an integer number (4592448).

Almost surely, 2^51903145 is an apocalyptic number.

It is an amenable number.

51903145 is a deficient number, since it is larger than the sum of its proper divisors (21576023).

51903145 is a wasteful number, since it uses less digits than its factorization.

51903145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47880.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51903145 is about 7204.3837349214. The cubic root of 51903145 is about 373.0192329566.

The spelling of 51903145 in words is "fifty-one million, nine hundred three thousand, one hundred forty-five".