51471421 has 2 divisors, whose sum is σ = 51471422. Its totient is φ = 51471420.

The previous prime is 51471397. The next prime is 51471451. The reversal of 51471421 is 12417415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 11148921 = 6350^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 51471421 - 2⁷ = 51471293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51471451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25735710 + 25735711.

It is an arithmetic number, because the mean of its divisors is an integer number (25735711).

Almost surely, 2^51471421 is an apocalyptic number.

It is an amenable number.

51471421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51471421 is an equidigital number, since it uses as much as digits as its factorization.

51471421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 25.

The square root of 51471421 is about 7174.3585776012. The cubic root of 51471421 is about 371.9821093065.

Adding to 51471421 its reverse (12417415), we get a palindrome (63888836).

The spelling of 51471421 in words is "fifty-one million, four hundred seventy-one thousand, four hundred twenty-one".