51420554 has 4 divisors (see below), whose sum is σ = 77130834. Its totient is φ = 25710276.

The previous prime is 51420553. The next prime is 51420559. The reversal of 51420554 is 45502415.

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

It can be written as a sum of positive squares in only one way, i.e., 44582329 + 6838225 = 6677^2 + 2615^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (51420553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12855137 + ... + 12855140.

Almost surely, 2^51420554 is an apocalyptic number.

51420554 is a deficient number, since it is larger than the sum of its proper divisors (25710280).

51420554 is a wasteful number, since it uses less digits than its factorization.

51420554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25710279.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 51420554 is about 7170.8126457188. The cubic root of 51420554 is about 371.8595309245.

Adding to 51420554 its reverse (45502415), we get a palindrome (96922969).

The spelling of 51420554 in words is "fifty-one million, four hundred twenty thousand, five hundred fifty-four".