51345521 has 2 divisors, whose sum is σ = 51345522. Its totient is φ = 51345520.

The previous prime is 51345487. The next prime is 51345533. The reversal of 51345521 is 12554315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 2890000 = 6961^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 51345521 - 2¹⁸ = 51083377 is a prime.

It is a super-2 number, since 2×51345521² = 5272725053522882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51345121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25672760 + 25672761.

It is an arithmetic number, because the mean of its divisors is an integer number (25672761).

Almost surely, 2^51345521 is an apocalyptic number.

It is an amenable number.

51345521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51345521 is an equidigital number, since it uses as much as digits as its factorization.

51345521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 26.

The square root of 51345521 is about 7165.5789019450. The cubic root of 51345521 is about 371.6785700930.

Adding to 51345521 its reverse (12554315), we get a palindrome (63899836).

The spelling of 51345521 in words is "fifty-one million, three hundred forty-five thousand, five hundred twenty-one".