51344621 has 2 divisors, whose sum is σ = 51344622. Its totient is φ = 51344620.

The previous prime is 51344617. The next prime is 51344627. The reversal of 51344621 is 12644315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 7396 = 7165^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 51344621 - 2² = 51344617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51344627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25672310 + 25672311.

It is an arithmetic number, because the mean of its divisors is an integer number (25672311).

Almost surely, 2^51344621 is an apocalyptic number.

It is an amenable number.

51344621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51344621 is an equidigital number, since it uses as much as digits as its factorization.

51344621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 51344621 is about 7165.5161014403. The cubic root of 51344621 is about 371.6763984484.

Adding to 51344621 its reverse (12644315), we get a palindrome (63988936).

The spelling of 51344621 in words is "fifty-one million, three hundred forty-four thousand, six hundred twenty-one".