51948421 has 16 divisors (see below), whose sum is σ = 62265600. Its totient is φ = 42375168.

The previous prime is 51948409. The next prime is 51948431. The reversal of 51948421 is 12484915.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51948421 - 2⁷ = 51948293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51948401) 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, 36165 + ... + 37573.

It is an arithmetic number, because the mean of its divisors is an integer number (3891600).

Almost surely, 2^51948421 is an apocalyptic number.

It is an amenable number.

51948421 is a deficient number, since it is larger than the sum of its proper divisors (10317179).

51948421 is a wasteful number, since it uses less digits than its factorization.

51948421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668.

The product of its digits is 11520, while the sum is 34.

The square root of 51948421 is about 7207.5253034589. The cubic root of 51948421 is about 373.1276651166.

The spelling of 51948421 in words is "fifty-one million, nine hundred forty-eight thousand, four hundred twenty-one".