51454021 has 4 divisors (see below), whose sum is σ = 51799500. Its totient is φ = 51108544.

The previous prime is 51454001. The next prime is 51454027. The reversal of 51454021 is 12045415.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11902500 + 39551521 = 3450^2 + 6289^2 .

It is a cyclic number.

It is not a de Polignac number, because 51454021 - 2¹¹ = 51451973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51453983 and 51454001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51454027) 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, 172516 + ... + 172813.

It is an arithmetic number, because the mean of its divisors is an integer number (12949875).

Almost surely, 2^51454021 is an apocalyptic number.

It is an amenable number.

51454021 is a deficient number, since it is larger than the sum of its proper divisors (345479).

51454021 is a wasteful number, since it uses less digits than its factorization.

51454021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345478.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51454021 is about 7173.1458231379. The cubic root of 51454021 is about 371.9401881908.

Adding to 51454021 its reverse (12045415), we get a palindrome (63499436).

The spelling of 51454021 in words is "fifty-one million, four hundred fifty-four thousand, twenty-one".