51332081 has 2 divisors, whose sum is σ = 51332082. Its totient is φ = 51332080.

The previous prime is 51332069. The next prime is 51332087. The reversal of 51332081 is 18023315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45495025 + 5837056 = 6745^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 51332081 - 2¹⁸ = 51069937 is a prime.

It is a super-2 number, since 2×51332081² = 5269965079581122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3076142 and since 51332081 and 3076142 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51332087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25666040 + 25666041.

It is an arithmetic number, because the mean of its divisors is an integer number (25666041).

Almost surely, 2^51332081 is an apocalyptic number.

It is an amenable number.

51332081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51332081 is an equidigital number, since it uses as much as digits as its factorization.

51332081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51332081 is about 7164.6410238057. The cubic root of 51332081 is about 371.6461375600.

Adding to 51332081 its reverse (18023315), we get a palindrome (69355396).

The spelling of 51332081 in words is "fifty-one million, three hundred thirty-two thousand, eighty-one".