51884921 has 6 divisors (see below), whose sum is σ = 57030666. Its totient is φ = 47168000.

The previous prime is 51884897. The next prime is 51884927. The reversal of 51884921 is 12948815.

It can be written as a sum of positive squares in only one way, i.e., 43705321 + 8179600 = 6611^2 + 2860^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51884921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51884927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214280 + ... + 214521.

It is an arithmetic number, because the mean of its divisors is an integer number (9505111).

Almost surely, 2^51884921 is an apocalyptic number.

It is an amenable number.

51884921 is a deficient number, since it is larger than the sum of its proper divisors (5145745).

51884921 is a wasteful number, since it uses less digits than its factorization.

51884921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428823 (or 428812 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 51884921 is about 7203.1188383922. The cubic root of 51884921 is about 372.9755702314.

The spelling of 51884921 in words is "fifty-one million, eight hundred eighty-four thousand, nine hundred twenty-one".